Gardening in the Pacific Northwest

Acorn squash performs reasonably well in the PNW, especially in eastern Oregon and Washington. Western coastal climates may not accumulate enough heat for reliable fruit maturity without row cover.

West of the Cascades, amaranth tends to perform better for greens than grain — the cool marine climate and shorter season can limit seed maturation. East of the mountains, the warmer, drier conditions suit grain production well.

West of the Cascades, the mild winters and cool springs of the maritime Pacific Northwest can allow artichokes to overwinter in zones 8 and warmer, particularly with winter mulching. East of the Cascades, colder winters usually force annual production with vernalization.

The cool PNW spring is excellent for arugula. The season extends naturally into June in many years before heat arrives. Fall crops from August or September seed can last through November in coastal areas.

Asparagus tends to perform well in the Pacific Northwest, where cool, moist springs suit its growth habit. West of the Cascades, good drainage is essential — many valley soils hold water, and raised beds prevent crown rot in wet years.

Beets perform reliably in the Pacific Northwest's cool climate. The long mild fall is excellent for a second planting; roots left in the ground through October and November tend to be the sweetest of the season.

Excellent spring and fall crops in the PNW. The cool, moist climate is nearly ideal. Fall crops from August seed often yield well into November.

The PNW's cool, cloudy springs are nearly ideal for broccoli. Fall plantings often extend into November without bolting. Watch for aphid pressure in wet years.

One of the best climates for Brussels sprouts in North America. Cool, damp fall weather extends the harvest season well into November and December. Plants can stand through mild PNW winters in zones 8b and 9.

The long cool fall in the PNW can actually help butternut — the fruit continues to mature into September and October. Start seeds indoors to buy time on the front end.

Cabbage thrives in the PNW's cool, moist climate. Fall crops planted in July often mature beautifully into October and November. Slugs can damage outer leaves in wet years.

Cantaloupe needs more heat than western Oregon or Washington typically provides. Eastern PNW locations and warm coastal microclimates can succeed; use black plastic mulch to gain soil warmth.

The cool, moist springs of the Pacific Northwest tend to suit carrots well — germination is often more reliable than in drier climates because the soil stays naturally damp. Clay-heavy soils in many PNW valleys may require raised beds or deep soil loosening to prevent forked roots.

Among the best climates for cauliflower in North America. Cool, overcast springs and long mild autumns give the plant exactly what it needs. Fall crops often produce excellent heads with little intervention.

The cool, moist climate of the Pacific Northwest tends to suit celeriac well, especially west of the Cascades where consistent rainfall through summer and fall keeps the soil from drying out. Clay soils may require raised beds or deep compost amendments to give the roots room to size up properly.

The cool, moist climate west of the Cascades can be ideal for celery if the soil is rich and well-amended. The main challenge tends to be slug damage on young transplants in wet springs — copper barriers or diatomaceous earth around plants may help.

Collards produce well in PNW climates. The mild winters in zones 8 and 9 allow plants to stand through the season. They tend to receive less attention here than in the South, but can be a reliable year-round green.

Sweet corn is possible in the warmest parts of the PNW — eastern Oregon and Washington in particular. Western Oregon's cooler summers limit season length; choose early varieties of 75 days or fewer.

West of the Cascades, mild summers stretch the spring harvest longer than in most of the country, and fall sowings often keep producing into early winter. Watch for slugs on seedlings in wet weather.

The cool, damp climate west of the Cascades tends to challenge cucumbers — germination and early growth can be slow, and powdery mildew arrives early in the humid air. Growing under row cover or in a cold frame can extend the season, and choosing mildew-resistant varieties tends to improve results noticeably.

Delicata tends to perform better than butternut in the PNW's variable summers because its shorter season (80 days) leaves a larger buffer before fall. Western Oregon and Washington can usually manage a successful crop.

The cool marine climate west of the Cascades leaves a tight window of the warmth edamame needs, making early-maturing varieties like Envy a safer bet than long-season types. The narrow harvest window means gardeners should check pods every day once they begin to fill in late summer.

Eggplant tends to struggle in the PNW's cool summers unless grown under row cover or in a polytunnel. Short-season varieties like Fairy Tale give the best chance.

The cool, damp falls west of the Cascades tend to suit endive well, though slug pressure can be significant in the dense heads. Starting in late July or early August usually allows harvest through October and November, sometimes into December if protected from hard frost.

The cool, moist falls west of the Cascades suit escarole well, and plants often continue producing into November or December with minimal protection. Spring sowings in the maritime Northwest may bolt less rapidly than in warmer regions, but fall remains the more reliable season.

Fava beans thrive in the PNW's long cool springs. In western Oregon and Washington, they can be planted in fall for overwintering and early spring harvest — Aquadulce is the traditional choice for this. Spring-planted favas in the PNW can produce into June before summer heat arrives. Black bean aphids are common in the mild, moist PNW climate.

The mild falls of the Pacific Northwest tend to suit fennel well, and late-summer sowings often produce excellent bulbs by October or November. Spring sowings west of the Cascades can work in cooler years, but the transition to longer days in May and June frequently triggers bolting before bulbs reach full size.

Spanish Roja thrives in the cool, wet winters of the Pacific Northwest and is considered a regional heirloom. Plant in October and expect to harvest in late July; the mild, damp spring can favor white rot, so drainage is critical.

West of the Cascades, the cool spring can delay bean planting until late May or early June, and even then the soil may be slower to warm than the calendar suggests. Bush beans tend to mature more reliably than pole types in the shorter, cooler summers of western Oregon and Washington.

The cool maritime climate west of the Cascades tends to challenge ground cherries — the season is often too short for heavy production, and the plants may not ripen their full crop before fall frost. Growing under a south-facing eave or in a high tunnel can extend the season meaningfully.

Horseradish tends to do well in the cool, moist conditions west of the Cascades and can spread aggressively in garden soils that stay damp. Containment or planting at the garden's edge is particularly important in western Oregon and Washington where the mild winters allow year-round root growth.

Sunchokes thrive in the Pacific Northwest's moderate climate and tolerate the region's heavy winter rains well. The main concern is containment — the long growing season allows them to spread widely, and the mild winters mean tubers rarely experience the hard freezes that might limit their persistence in colder regions.

Kale thrives in the mild, wet winters west of the Cascades and can often be harvested through the entire winter. Cabbage worms can be persistent in the long growing season; row cover or regular hand-picking tends to be necessary. Overwintered plants often produce heavily in early spring before bolting.

Performs well in the PNW's cool spring weather. Can be sown earlier than most regions. Fall crops also work well with August sowing.

West of the Cascades, nights are often too cool for peppers to ripen red before the first fall frost. Most gardeners get a good green harvest; for red peppers to dry, grow a few plants in large pots against a south-facing wall or under a hoop house. East of the mountains, the hotter, drier summers ripen red peppers more reliably.

West of the Cascades, mild falls suit mu well and roots can size slowly into late fall. Wet soils encourage cabbage maggot and slugs; grow in raised beds and keep row cover on. East of the mountains, sow on time and water daily through late-summer heat.

West of the Cascades, wait for the soil to warm before transplanting; a black plastic mulch or a row cover for the first weeks helps. Powdery mildew tends to arrive early in the damp air, so a trellis that lifts the vine into moving air is worth the effort. Vine borers are uncommon here.

The Pacific Northwest's long, mild fall is ideal for leeks — harvest can extend well into November and December in coastal areas. Winter-hardy varieties like Bandit can overwinter in zones 8 and above, providing harvest through late winter.

The cool maritime climate of the Pacific Northwest tends to extend the lettuce season well into summer, especially west of the Cascades where temperatures stay moderate. Fall sowings often produce harvestable leaves through December in mild winters.

West of the Cascades, the cool maritime climate tends to challenge lima beans — the season is often too short and too cool for reliable pod set, especially for pole varieties. Bush types sown in late May in the warmest available spot may produce a modest harvest in a good year, but lima beans are generally not a strong choice for western Oregon and Washington.

West of the Cascades, the cool marine climate can limit Malabar spinach performance — the long wait for genuinely warm soil means transplants often don't go out until late June, shortening the productive season. Growing in containers on a south-facing patio or against a heat-retaining wall may help.

Performs very well in PNW springs and falls. The cool, moist climate delays bolting and produces tender, flavorful leaves. Fall crops from August seed often last well into November.

West of the Cascades, mild falls give napa a long, slow heading period and good quality. Wet weather late in the season brings slugs and soft rot, so keep beds clean and harvest before extended cold rain. East of the mountains, late-summer heat at sowing calls for shade cloth and daily watering.

New Zealand spinach tends to do well in the Pacific Northwest once the soil warms in late spring, though the cool marine summers may slow growth compared to hotter regions. It rarely suffers from the slug pressure that plagues other greens, and it can handle the occasional dry spell common in July and August west of the Cascades.

Okra is marginal in the PNW except in the warmest eastern locations. Cool summers rarely accumulate enough heat for consistent production; if you try it, use a south-facing wall for reflected heat.

The Pacific Northwest is prime territory for long-day onions — Walla Walla originated in Washington state. Long, mild springs and dry summers give bulbs time to develop without excessive disease pressure. Direct sowing in late winter is an option in milder coastal areas.

The Pacific Northwest's cool, wet springs are well-suited to parsnip germination. The long mild fall extends the harvest window significantly — roots can often be left in the ground through November and December, sweetening with each frost.

The cool, extended springs west of the Cascades often give peas a longer harvest window than in warmer regions — production can continue into early June in some years. Powdery mildew tends to show up later in the season but rarely becomes severe before the harvest is finished.

The Pacific Northwest's cool maritime climate and short season make peanuts nearly impossible west of the Cascades. Even in warmer inland areas, the 120- to 150-day requirement and the need for sustained summer heat eliminate most sites. A few gardeners in the warmest microclimates of southern Oregon may get a marginal crop with early-maturing varieties, but it remains an experimental crop at best.

The cool marine climate west of the Cascades makes peppers challenging — the season is often too short and too cool for reliable fruit set. Hot peppers and fast-maturing sweet types like Jimmy Nardello tend to outperform bell peppers. Growing in containers against a south-facing wall or in a hoop house can meaningfully extend the productive window.

West of the Cascades, the cool, damp fall weather can make it difficult to dry popcorn ears adequately on the stalk — early-maturing varieties and bringing ears indoors to finish curing tend to work better than waiting for field drying. East of the Cascades, the drier climate suits popcorn well.

The Pacific Northwest's cool, moist climate favors late blight — Phytophthora infestans thrives in the wet conditions of western Oregon and Washington. Choose blight-resistant varieties and plant in the most well-drained bed available. Early varieties often escape the worst late-season blight pressure.

The cool marine climate west of the Cascades can challenge pumpkins — the season is often too short for large carving types to mature fully, and powdery mildew pressure is intense in the damp air. Sugar pie and other small, fast-maturing varieties tend to perform better, and planting on south-facing slopes or raised hills helps warm the soil.

The mild, wet autumns west of the Cascades suit radicchio well — frost comes late enough that plants have plenty of time to mature, and the consistent moisture helps heads stay tight. Slugs can be persistent under the blanching mulch in the damp climate.

Spring and fall are both excellent windows for radishes in the Pacific Northwest's cool climate. Summer temperatures in many inland areas can close the window, but the coast stays cool enough for summer sowing. Fall radishes in September and October tend to be the most flavorful.

Rhubarb performs well in the Pacific Northwest where winters are cold enough for dormancy — generally east of the Cascades and in higher-elevation areas west of the mountains. In the mild coastal zones, plants may survive but tend to produce weak stalks and decline over time. Crown rot can be an issue in heavy winter rainfall; raised beds with excellent drainage help.

The Pacific Northwest's long, cool fall is well-suited to rutabaga. Sow in late June or early July for harvest from October through December. The mild, wet falls tend to provide ideal cold-sweetening conditions; lift before extended wet periods cause cracking.

The cool springs and mild falls of the Pacific Northwest tend to suit salsify's long growing season, though heavy clay in valley soils can be a challenge. Raised beds or deeply amended beds produce straighter roots. Overwintering in the ground is generally successful west of the Cascades, where the ground rarely freezes solid.

The cool, damp springs west of the Cascades tend to suit scallions well — they can be sown very early and often perform better than crops that need warm soil. Onion maggots can be a persistent problem in western Oregon and Washington; row cover from sowing is nearly essential.

The Pacific Northwest's cool, wet springs suit shallots well through the vegetative stage, but the humid conditions at harvest time can be a problem — lift bulbs as soon as the tops die back and move them immediately to a dry, covered curing space.

The cool, damp springs west of the Cascades tend to suit spinach well, though downy mildew can be persistent in wet years. Fall crops often perform better than spring crops because the marine influence keeps temperatures moderate into November.

Sweet potatoes need more heat than the western PNW typically provides. Eastern Oregon and Washington can succeed in a warm year. Black plastic mulch and row cover tunnels make a meaningful difference.

Swiss chard thrives in the PNW climate and can often be harvested from May through November from a single spring planting. In mild coastal areas, plants may overwinter in zones 8 and 9.

The cool, damp winters of the Pacific Northwest are ideal for tatsoi — plants sown in September often produce continuously through December and into February with minimal protection. Row cover or a cold frame can extend the harvest even further in western Oregon and Washington.

Tomatillos handle the PNW's cooler summers better than tomatoes do. They tend to set fruit at lower temperatures and can produce a meaningful crop even in years when tomatoes struggle.

West of the Cascades, the cool marine climate tends to challenge tomatoes — late blight is a persistent threat in the damp conditions, and the season is often too short for large heirloom varieties to ripen fully. Cherry tomatoes and early-maturing slicers like Siletz or Legend tend to do better than beefsteak types. Growing under cover or in a cold frame can significantly improve results in western Oregon and Washington.

The Pacific Northwest's long, cool fall is ideal for turnips. Fall sowings in late August through September tend to produce the best roots; leave Purple Top White Globe in the ground through October for maximum sweetness after the first frosts.

Watermelon is challenging in the PNW without a polytunnel or black plastic mulch. Cool summers rarely accumulate enough heat units for standard varieties; short-season types like Sugar Baby give the best odds.

West of the Cascades, yardlong beans tend to struggle — the cool marine summers rarely provide the sustained heat they need, and even in warm years the vines often produce only a handful of pods before fall arrives. Gardeners in the warmest microclimates may have better luck, but regular green beans or snap peas are more reliable choices for most of the region.

Zucchini tends to perform well west of the Cascades once the soil warms, though powdery mildew can arrive early in the damp marine air. Choosing resistant varieties and ensuring good air circulation around plants can extend the harvest window.

The marine influence tends to keep nights cooler than basil prefers, so PNW gardeners often find basil slow to take off until late June. Downy mildew can be a persistent problem in the damp coastal air; growing in containers on a sunny south-facing patio and watering only at the base may help.

West of the Cascades, bay laurel can survive outdoors in sheltered urban microclimates, but the damp winters tend to challenge it — overwatering from rainfall is a persistent risk. A container moved under an eave or into an unheated garage during the coldest months tends to perform better than one left exposed year-round.

Borage tends to thrive in the cool, moist springs of the Pacific Northwest and often self-seeds reliably. The mild winters west of the Cascades may allow some plants to overwinter as short-lived perennials, though most behave as annuals. Powdery mildew can appear in late summer when humidity is high.

The cool, moist springs west of the Cascades suit chamomile well — plants often bloom prolifically in May and June before the dry summer heat arrives. Self-seeding can be aggressive in the mild winters, and volunteer seedlings may appear year-round in some areas.

The cool, moist springs west of the Cascades suit chervil well, and it can often be grown through much of the summer in the maritime climate if given afternoon shade. Fall sowings tend to overwinter in mild areas, providing fresh leaves into early spring.

Chives do well in the Pacific Northwest. They emerge early in the cool wet spring and are productive through summer. The main issue is self-seeding — the moist climate suits germination, so deadhead consistently if you don't want volunteers throughout the garden.

Cilantro tends to perform well in the Pacific Northwest's cool springs and falls, and may hold through much of the summer west of the Cascades where temperatures stay moderate. Successive sowings from March through May and again in August often provide fresh leaves for six months or more.

The cool Pacific Northwest spring is ideal for dill — it stays in leaf production longer before bolting than in warmer climates. Start direct sowing 2 weeks before the last frost. Succession plant through July. Dill often self-seeds readily in this climate.

The cool maritime climate west of the Cascades tends to suit French tarragon well — summers rarely get hot enough to diminish flavor significantly. Winter survival can be marginal in the coldest inland valleys; a thick layer of mulch in late fall tends to help.

Grows well in the mild, moist climate, and leaves stay tender through cool summers. Wet winters in heavy clay can rot the bulbs, so a raised bed helps. Slugs chew the spring regrowth, and the damp fall suits self-sown seedlings, so deadhead promptly.

Cool nights west of the Cascades slow perilla down; wait until nights stay above 50°F before setting plants out, and give them the warmest, sunniest spot you have. Slugs can wipe out young transplants in damp springs. Seed ripens in fall, so cut flower spikes before the first rains settle in.

Western Oregon and Washington are some of the harder climates for lavender — wet winters are the enemy. Lavender grows famously at Sequim, WA, which sits in the Olympic rain shadow and receives far less rainfall than the surrounding region. For most of the wet PNW, raised beds with exceptional drainage and winter protection for the crown are necessary. East of the Cascades, the drier winters suit it much better.

Lemon balm does well in the Pacific Northwest's mild, moist climate. It may need more sun than the region's cloudy springs provide — a south-facing spot helps. Self-seeding is particularly prolific in the moist, sheltered conditions of western Oregon and Washington.

West of the Cascades, lemon verbena must be treated as a container plant and brought indoors by October. The cool, damp winters outdoors are fatal even with heavy mulch. A bright south-facing window or a cool greenhouse suits winter dormancy better than a dark basement.

The cool marine climate west of the Cascades can make lemongrass slow to establish — waiting until early June to transplant, rather than late May, often produces faster growth. Overwintering indoors is essential; no part of the plant survives a PNW winter outdoors.

Lovage thrives in the cool, moist conditions of the Pacific Northwest and may grow even more vigorously than in drier climates. The plant tends to hold its foliage well into fall in western Oregon and Washington, and the consistent rainfall reduces the need for supplemental irrigation once established.

Mint thrives in the Pacific Northwest's moist climate. It may need more sun than the region typically offers — a bright south-facing exposure helps. The main risk is rust fungus during wet springs; improve airflow and avoid overhead watering.

Oregon and Washington's wet winters are oregano's main challenge. Grow in raised beds or containers with sharp drainage, and cover the crown with gravel mulch to shed moisture. Plants can survive as perennials in most of the region, but wet clay soils kill them reliably.

The cool, moist Pacific Northwest is an excellent climate for parsley. It can stay productive and relatively unbothered by bolt for longer here than in warmer regions. Plant transplants at or just after the last frost and expect a long harvest through fall.

West of the Cascades, rosemary can overwinter as a perennial in zones 7 and 8 — Portland and Seattle both support it in sheltered spots. The enemy is winter wet, not winter cold. Plant in the most elevated, driest spot in the garden. In zone 6 areas of the PNW, treat as a container plant.

Wet winters are the primary risk. Sage planted in ground-level clay beds in western Washington and Oregon tends to decline by the third year. Raised beds with grit-amended soil, or large containers, extend the plant's life significantly. East of the Cascades, dry winters suit it much better.

The cool, moist springs of the Pacific Northwest suit shiso well — germination tends to be reliable even without stratification, and the plant tolerates the region's partial shade and damp conditions. Self-seeding can become aggressive in western Oregon and Washington gardens if flower spikes are not removed.

Sorrel is extremely well-suited to the PNW's mild, wet climate. It can produce leaves nearly year-round in western Washington and Oregon, going dormant only in the coldest weeks. It handles the shade of overcast spring days better than most early crops. Slug pressure in the wet PNW spring can be significant on the emerging leaves.

The cool, short summers west of the Cascades rarely provide enough accumulated heat for stevia to develop strong sweetness. East of the mountains, warmer summers may support the plant, but it remains a marginal crop. Container culture on a warm south-facing patio tends to improve results.

The damp springs and clay-heavy soils common west of the Cascades can challenge marjoram. Growing in raised beds or containers with excellent drainage tends to produce healthier plants than in-ground beds. The cooler nights may slow flavor development compared to warmer regions.

The wet Pacific Northwest winter is the main challenge. Thyme grown in ground-level beds in heavy western Oregon or Washington soil tends to rot. Raised beds with added grit, or containers brought under cover in January and February, produce much better results. East of the Cascades, the drier climate suits it well.

West of the Cascades, apple scab is nearly universal in unsprayed trees due to the wet springs, making disease-resistant varieties essential for backyard growers. Fire blight can be severe in warm, wet bloom periods. East of the Cascades, the drier climate reduces scab pressure but codling moth remains a persistent problem.

The mild, wet winters west of the Cascades tend to suit blackberries well — perhaps too well. Escaped cultivars have naturalized across the region and can be invasive. Cane diseases like anthracnose and rust are persistent problems in the damp climate; choosing resistant varieties and thinning canes for airflow is especially important.

The PNW is one of the best blueberry regions in the country. Western Washington and Oregon's naturally acidic soils often need less amendment than soils in other regions. Duke, Bluecrop, and Draper are widely grown commercially in the region. Rain during bloom is common — shake plants gently on dry days to help pollination when bees are inactive.

West of the Cascades, the cool, wet springs tend to create serious brown rot pressure on both sweet and sour cherries. Many PNW growers find that even with careful pruning and sanitation, fungicide sprays become necessary in most years. Sweet cherries can struggle to ripen fully in the cooler maritime climate; sour varieties and early-ripening sweets like Stella tend to perform more reliably.

The cool, moist climate west of the Cascades suits currants well, though powdery mildew can be persistent in humid summers. Red and white currants typically perform better than black currants in western Washington and Oregon, where summer humidity tends to favor mildew development.

Elderberry thrives in the moist climate west of the Cascades, and the cool, damp springs suit the flowering period well. Birds can be a serious issue — netting before the berries ripen is nearly essential in areas with dense robin populations.

West of the Cascades, cool summers and mild winters create mixed results for figs. The season is often too short and too cool for reliable ripening, even in protected spots. Container culture with a south-facing wall may extend the season enough for early varieties like Celeste, but many PNW gardeners find figs frustrating compared to other fruit.

The cool, moist climate west of the Cascades suits gooseberries well in terms of temperature, but the humidity creates persistent powdery mildew pressure. Planting resistant varieties and siting bushes where they get morning sun and good airflow tends to keep the disease manageable. Check county regulations in Washington and Oregon before planting near commercial white pine stands.

Western Oregon and Washington provide good conditions for grapes, particularly in the warmer valleys and south-facing slopes. Powdery mildew is common in the dry summers east of the Cascades; west of the Cascades, black rot and downy mildew tend to be more problematic in the damper air. European vinifera varieties generally perform better here than in most of the country.

Mulberries tend to perform well west of the Cascades in the mild maritime climate, though the cool springs can delay ripening slightly compared to warmer regions. Popcorn disease can be more common in the damp conditions; pruning for airflow and removing affected fruit helps.

Pawpaws are not native to the Pacific Northwest and can struggle with the region's cool summers and lack of heat accumulation, especially west of the Cascades. They may survive but are unlikely to fruit reliably without a very warm microclimate.

West of the Cascades, peaches struggle with the wet springs that favor brown rot and peach leaf curl. The marine climate also tends to lack the summer heat needed to ripen fruit fully, and many varieties never develop good flavor. East of the Cascades, in drier valleys, peaches perform much better if late frosts can be avoided.

West of the Cascades, the marine climate provides good chill hours for pears, but the damp springs can bring severe fire blight pressure. Resistant varieties like Harrow Sweet tend to perform better than Bartlett. East of the Cascades, the drier climate reduces disease risk and many varieties do well.

The wet springs and summers west of the Cascades create ideal conditions for brown rot, which can take an entire plum crop in a single wet week. Japanese varieties tend to struggle with the cool spring nights and may not ripen well; European types like Italian Prune or Damson are more reliable.

The PNW is prime raspberry country. Cool, mild summers produce excellent fruit quality, and varieties like Willamette (floricane) were developed in the region. Botrytis on ripening fruit is a concern in wet June harvests — harvest frequently and remove any moldy fruit promptly. Spotted Wing Drosophila (SWD) is a significant pest in the PNW — the small fly lays eggs in soft fruit just before ripening. Monitor with traps.

Serviceberry is native to parts of the Pacific Northwest and thrives in the cool, moist conditions west of the Cascades. It tends to perform well without irrigation once established, though mulching helps in drier microclimates. Birds are especially aggressive during spring migration.

The PNW is excellent strawberry country for June-bearers — cool, moist springs are ideal for fruit development. Hood is a PNW-developed variety worth seeking out locally. Botrytis gray mold is a consistent issue in the wet PNW spring; mulch carefully and give plants good air circulation.

Bee balm can struggle west of the Cascades where cool, damp springs favor mildew development early in the season. Mildew-resistant varieties are nearly essential, and planting in the sunniest, best-drained spots tends to reduce disease pressure. The plant may spread less aggressively in the cooler maritime climate than in warmer regions.

Butterfly weed can struggle west of the Cascades where the soil tends to be heavy and wet through spring. Planting in raised beds or on slopes with added gravel may help, but the damp maritime climate is far from its native dry-meadow habitat. East of the Cascades in the drier interior valleys, it tends to perform much better.

Calendula is exceptionally well-suited to the PNW's cool, wet springs and mild falls. It can bloom from early spring through June, rest in summer, and return in September and October. In mild-winter coastal areas, it may survive winter entirely and bloom nearly year-round. Powdery mildew is common in the fall rainy season — space plants well.

Cosmos can be slow to start in the PNW's cool spring but picks up quickly once summer heat arrives. Sow at last frost or a week or two after in coastal areas where springs stay cool. In the Willamette Valley and western Washington, aphids tend to show up mid-summer but rarely cause lasting damage.

The cool, damp summers west of the Cascades can worsen powdery mildew pressure on garden phlox, making resistant cultivars even more essential. Good air circulation and avoiding overhead watering are particularly important in the maritime climate.

The Pacific Northwest is lupine country — the cool summers and naturally acidic soils of the region suit the plant perfectly, and roadside stands of wild lupines are common in May and June. Garden varieties tend to naturalize readily west of the Cascades if allowed to self-sow.

Marigolds grow well in the PNW once summer warmth arrives but can be slow to bloom in cool coastal springs. Start indoors 6 weeks before last frost and wait until nighttime temperatures are consistently above 50°F before transplanting. Botrytis is more common in the rainy PNW fall — remove spent flowers promptly as the season winds down.

Morning glories tend to perform well west of the Cascades once the soil warms, though the cool marine climate can delay flowering slightly compared to warmer regions. Self-seeding is less aggressive here than in the Southeast, as fewer seeds overwinter successfully in the damp winters.

Nasturtiums do well in the PNW's mild summers and are among the more reliable annuals in cool, overcast coastal conditions. They tend to sprawl enthusiastically in western Washington and Oregon's moderate summers. Aphid pressure can be high — the trap-crop function is genuinely useful in vegetable gardens here.

Peonies generally perform well in the Pacific Northwest, where cool springs and adequate winter chill suit them. West of the Cascades, botrytis blight can be a persistent problem in the damp springs — good air circulation and prompt removal of affected buds tend to keep it manageable.

Purple coneflower can struggle in the wet winters west of the Cascades unless planted in raised beds or very well-drained soil. Crown rot is a persistent risk in heavy clay that stays soggy from November through March. East of the Cascades, the drier climate suits the plant much better.

The cool, moist springs west of the Cascades suit snapdragons well — plants often bloom from April through early June before heat slows them. Fall rebloom is common if plants are cut back in midsummer. Rust can be persistent in the damp coastal air; spacing plants generously and removing affected leaves early helps.

Sunflowers generally do well west of the Cascades despite the cooler marine climate, though they tend to stay shorter and bloom later than in warmer regions. The damp conditions can occasionally encourage powdery mildew on the leaves late in the season, but the plants usually bloom well before it becomes a problem.

The cool, moist springs west of the Cascades suit alyssum well, and plants often bloom continuously from April through June. Summer heat stress is less severe than in hotter regions, but overwatering in the damp climate can cause crown rot — plant in well-drained spots and avoid daily irrigation.

The cool, maritime summers of western Oregon and Washington are ideal for sweet peas, which can bloom from May into September in favorable years. Coastal gardeners often get the longest season of any region in North America, sometimes extending into October if nights stay mild.

West of the Cascades, coreopsis tends to struggle with the heavy winter rains and clay soils common in the region — root rot can be a persistent issue. Planting in raised beds or amending with coarse sand to improve drainage often helps. The threadleaf varieties like 'Moonbeam' and 'Zagreb' tend to tolerate the damp better than C. grandiflora types.

Zinnias tend to thrive in the PNW's dry summers but can struggle to get started in cool, wet springs. Wait until the soil is reliably above 65°F before direct-sowing, which may be a week or two later than your last frost date. Powdery mildew can appear earlier than in drier regions — choose Oklahoma or Zahara if it's been a wet year.

Buckwheat tends to do well in the warm, dry summers west of the Cascades, though the shorter frost-free window at higher elevations may limit late-season sowings. In the maritime climate, terminating before seed set is especially important because the mild, wet autumns allow volunteer seeds to germinate and establish easily.

West of the Cascades, crimson clover tends to establish well in fall and overwinter reliably in the mild marine climate. The wet springs can sometimes lead to uneven germination if sown too late in autumn; aim for early September sowing to allow good establishment before winter rains begin.

Field peas tend to perform very well west of the Cascades, where the mild, wet winters suit fall-sown stands. Overwintered Austrian Winter pea often blooms in April and can be terminated before the main vegetable planting season. Wet springs may encourage slug damage on young seedlings.

Hairy vetch performs well west of the Cascades, where wet winters favor establishment and spring growth. The long, cool springs typical of the region allow for excellent biomass production before termination. Slugs can damage young seedlings in wet falls; delaying sowing until late September may reduce slug pressure.

West of the Cascades, mild winters may allow oats to overwinter rather than winter-kill, which creates a spring management problem. East of the Cascades, the colder winters tend to reliably kill oats sown in late summer, making them a dependable self-terminating cover.

West of the Cascades, mild winters often prevent full winter-kill, which means tillage radish can volunteer heavily in spring crops. Mowing or tilling before seed set is necessary. The long fall growing season does allow later sowings than in colder regions — mid-September can still produce a functional root in many PNW locations.

The cool, moist climate of the Pacific Northwest is ideal for white clover, which tends to stay green nearly year-round west of the Cascades. Establishment is usually reliable with spring sowing, and the plants persist well in the moderate shade common under fruit trees and in garden pathways.

Winter rye performs well west of the Cascades, where mild winters and fall rain suit its growth habit. Termination timing in the maritime climate tends to fall in late April or early May; waiting for anthesis is particularly important in the damp conditions where residue decomposes slowly.