Gardening in the Southwest

Spring and fall crops both possible. Summer heat can stress plants during fruit set; spring planting that finishes before peak summer, or fall planting, tends to produce cleaner results.

The hot, dry Southwest provides excellent conditions for amaranth grain production. The plant's drought tolerance makes it well-suited to low-water gardens, and the dry air simplifies seed head drying and storage.

The low-desert Southwest can support fall-planted artichokes that vernalize naturally through mild winters and produce buds in March and April before summer heat. Higher elevations may need to grow them as annuals with vernalization, though the long warm season can support a full crop if started early enough.

A winter crop in most of the region — plant in October and November for harvest December through February. Heat prevents spring and summer production. Irrigation consistency is critical in arid conditions.

Asparagus struggles in the low desert Southwest, where winters may not be cold enough to trigger dormancy. Higher-elevation areas with cold winters tend to produce better results; in the desert, asparagus is often not worth the space.

In the low desert, beets are a fall and winter crop — sow in September through November and harvest through spring. Summer heat makes spring planting impractical in most of Arizona and New Mexico.

Grown as a winter crop from October through March in most of the region. Not viable in summer. Irrigation consistency is critical in dry conditions.

A cool-season winter crop in most of the region. Plant transplants in September through October for harvest December through February. Not viable during the hot summer months.

Not well-suited to most of the Southwest. The region lacks the extended cool period Brussels sprouts require. In higher-elevation areas of New Mexico and Colorado, fall crops may be possible.

Spring planting works well, with harvest before the worst summer heat. A fall crop planted in late summer can mature in the more moderate temperatures of October and November in low-desert areas.

Grown as a winter crop in most of the region. Transplant in October or November for harvest in January through March. Not suitable for planting in summer heat.

The Southwest's long warm season is ideal. Spring crops may face heat stress at the peak of summer; planting early (relative to last frost) and harvesting before the hottest months often works best.

Carrots can be grown in fall, winter, and early spring in the low-desert Southwest, where summer heat makes spring-sown crops difficult. A fall sowing timed to mature in December or January often produces very sweet roots in the cool desert nights.

Grown as a winter crop from October transplants, harvesting January through March. Summer heat makes it impossible. Irrigation is critical — consistent moisture is harder to maintain in arid conditions.

The intense summer heat and low humidity of the Southwest make celeriac difficult to grow — the plant demands consistent moisture and cool temperatures, neither of which are easy to provide in desert climates. Fall plantings in the low desert may be more successful than spring attempts.

Celery can be grown as a winter crop in low-desert areas, planted in early fall for winter harvest. Summer heat makes spring plantings impractical in most of the Southwest — bolting and bitterness are nearly inevitable in 90+ degree weather.

Primarily a cool-season crop here, planted in fall for winter and early spring harvest. The summer heat is too intense for most varieties. In higher-elevation areas, summer production may be possible.

Spring planting works well before peak summer heat. A second planting in late summer for fall harvest is common in the desert Southwest. Water consistently — corn under drought stress at tasseling will have poor kernel fill.

A fall-sown winter and early-spring crop in the low deserts and coastal valleys; summer heat ends it. Along the central and southern California coast it is listed as invasive, so harvest or deadhead before plants set seed.

The hot, dry Southwest can stress cucumbers during peak summer heat, leading to bitterness and reduced production. Providing afternoon shade during the hottest weeks and ensuring consistent soil moisture with drip irrigation or soaker hoses tends to keep plants productive longer. Fall plantings may be more successful in low-desert areas.

Spring planting finishing before peak summer heat works best. Alternatively, a late-summer planting for October-November harvest is a useful option in the mild desert fall.

Edamame can be grown in the Southwest in spring and fall, avoiding the peak summer heat that can cause flowers to drop. A spring sowing timed to harvest in June, or a late-summer sowing for October harvest, tends to produce the best pod fill and flavor.

The desert Southwest's intense heat is near-ideal for eggplant during spring and fall. Avoid the peak of summer in low-desert areas where temperatures may exceed fruit-set thresholds.

In the low-desert Southwest, endive is a winter crop. Sowing in September or October for harvest from December through February takes advantage of the mild winters and avoids the intense heat that makes the leaves unbearably bitter.

Escarole is primarily a fall, winter, and early spring crop in the Southwest, where summer heat makes it nearly impossible to grow. Sowings timed for November or December harvest tend to produce the mildest, most tender leaves in the cooler desert nights.

In the desert Southwest, favas are a cool-season crop planted in fall for harvest in late winter and early spring. In Phoenix and Tucson, plant in October or November for January through March harvest. Avoid planting too late — summer heat comes early and ends the season abruptly.

Fennel is a winter crop in the low-desert Southwest, sown in September or October for harvest in January or February. The mild winter temperatures and short days create ideal conditions for bulb development, and bolting is rarely an issue during the cool season.

Garlic can be grown as a fall-to-spring crop in the low desert, planted in October and harvested in April before summer heat arrives. Softneck varieties perform better in the mild winters of Arizona and New Mexico than hardneck types.

In the low desert, beans are typically grown as a spring or fall crop, planted in March or August. Summer temperatures above 100 degrees cause flowers to abort, so timing plantings to avoid peak heat is critical for a productive harvest.

The long, hot growing season of the low desert is well-suited to ground cherries, which can produce from late spring through fall. In the intense summer heat, afternoon shade may help prevent blossom drop during the hottest weeks.

Horseradish is generally unsuitable for the low-desert Southwest, where the lack of winter cold prevents proper flavor development. It may perform marginally in higher-elevation areas of New Mexico and Arizona where winters are cold, but containment remains a concern.

Sunchokes can be grown in the cooler, higher-elevation parts of the Southwest, but the low desert's extreme summer heat and lack of winter chill may stress the plants. They perform better in mountain and plateau regions where winter temperatures drop consistently below freezing.

Kale is primarily a fall, winter, and early spring crop in the low-desert Southwest, where summer heat makes warm-season production nearly impossible. Planted in September or October, kale can produce heavily through the mild desert winter and into March before bolting. Aphids tend to be more persistent than cabbage worms.

Grown as a cool-season winter crop in most of the region. Sow in October for winter harvest. The heat of summer and early fall prevents spring or summer production.

Plenty of heat for ripening, and the dry air suits sun-drying. Temperatures above about 95°F can cause blossom drop, so afternoon shade cloth and steady drip irrigation help keep fruit setting. In the low desert, plants often produce in two flushes, before and after the hottest weeks.

In the low desert, grow mu as a cool-season crop, sowing once daytime highs drop below about 90°F and harvesting through winter. Keep irrigation steady to prevent cracking. At higher elevations, follow mountain-west timing.

In the low desert, plant in spring to harvest before peak heat, and again in late summer for a fall crop. Temperatures above about 95°F often stop fruit set. Shade cloth in the afternoon and deep drip irrigation help the vines through the hottest stretch.

Leeks can be grown as a fall and winter crop in the low desert. Transplant in September or October after summer heat subsides; harvest through winter and early spring before temperatures climb again.

Lettuce is primarily a fall, winter, and early spring crop in the low-desert Southwest. Summer heat makes growing it impractical without significant shade and evaporative cooling; fall plantings sown in September or October tend to be most successful.

The warm, sunny Southwest provides excellent conditions for lima beans in spring and early summer, but the extreme heat of midsummer often causes flower drop. Planting in March or early April to get bloom before temperatures climb above ninety-five degrees tends to produce the best results in the low desert.

The intense heat of the Southwest suits Malabar spinach well, and it can produce through summer months when most greens fail. Consistent watering during the hottest weeks tends to keep the leaves tender; plants may slow production if temperatures exceed 105°F for extended periods but typically resume once the heat breaks.

A winter crop planted in October through December, harvested through winter and early spring. Heat makes spring and summer growing impossible in most of the region.

In the low desert, grow napa as a cool-season crop, sowing once daytime highs drop below about 90°F and harvesting through winter. Haku is noted for good performance in Arizona and California. At higher elevations, follow mountain-west timing.

The intense heat and low humidity of the Southwest are among the best conditions for New Zealand spinach — it handles triple-digit temperatures and infrequent watering better than almost any other leafy green. Afternoon shade may extend the harvest window slightly in the low desert.

The Southwest's heat is ideal for okra. In low-desert areas, okra can produce from late spring through early fall with consistent irrigation. One of the most productive vegetables available in the desert summer.

The Southwest spans both short-day and long-day territory depending on latitude. Southern Arizona and New Mexico gardens favor short-day varieties planted in fall for spring harvest; gardeners at higher elevations and latitudes may have better luck with day-neutral or long-day types.

Parsnips are rarely grown in the low desert Southwest due to hot summers that interfere with development and mild winters that don't provide adequate cold sweetening. Higher-altitude gardens in New Mexico and Colorado have better conditions.

In the low-desert Southwest, peas are typically a winter crop. Sowing in November or December allows the plants to mature in the mild temperatures of February and March, before the heat of late spring ends production.

The low deserts of Arizona and southern California have the heat and the season length, but peanuts still need consistent moisture during flowering and peg formation — supplemental irrigation is required. Sandy soils in the region tend to suit the crop well, and fall-harvested peanuts can be excellent if the plants received enough water through the summer.

The intense heat of the Southwest suits peppers well in spring and fall, though extreme summer temperatures above 100 degrees often cause blossom drop. Many Southwest gardeners find that peppers planted in late winter for a spring crop, then cut back and allowed to regrow in fall, produce more total fruit than a single summer planting.

The warm, dry Southwest is generally favorable for popcorn, particularly in spring plantings that mature before the peak summer heat. The arid climate makes field drying and post-harvest curing straightforward, though consistent irrigation during tasseling is critical in low-desert areas.

Potatoes can be grown as a winter crop in the low desert, planted in January or February and harvested before summer heat arrives. In higher-elevation gardens, spring planting with early varieties works well; summer heat shuts down tuber development.

The warm, sunny Southwest provides excellent conditions for pumpkins in spring and fall, but midsummer heat above 95 degrees can cause blossom drop and poor fruit set. Planting in late spring for a fall harvest or very early spring for a June harvest tends to work better than trying to grow through peak summer.

In the low desert, radicchio is best grown as a winter crop rather than a fall crop — sow in September or October for harvest in December through February, when nighttime temperatures drop enough to temper the bitterness without freezing the plants.

Fall and winter are the main radish seasons in the low desert. Sow from September through February; the mild winter climate produces excellent results with minimal pest pressure.

Rhubarb is not viable in the low desert or most of the Southwest — the lack of winter cold prevents dormancy and plants fail within a season or two. Only high-elevation mountain areas with genuine winter cold can sustain rhubarb over the long term.

Not well-suited to the low desert Southwest, where hot summers interfere with midsummer sowings and winters are too mild for cold-sweetening. Higher-elevation gardens in Colorado and New Mexico may have better success.

Salsify can be grown as a winter crop in the low-desert Southwest, sown in October or November for harvest in March or April. The mild winters provide the long, cool growing period the crop prefers, though irrigation must be consistent.

In the low desert, scallions are typically grown in fall, winter, and early spring — summer heat causes rapid bolting and poor flavor. Sowings from September through February tend to give the best results.

Fall-planted shallots can be grown as a cool-season crop in the low desert, harvested before summer heat arrives. The dry climate is excellent for curing; storage life is typically very good in a cool interior space.

In the low desert, spinach is a winter crop. Sow in October or November for harvest through the cool months; summer temperatures make growing spinach impossible without significant shade and even then the plants tend to bolt.

The desert Southwest's long warm season is excellent for sweet potatoes. Spring planting works well; irrigation management is the primary variable, as drought stress late in the season reduces root size.

Best grown as a fall and winter crop in hot lowland areas. In higher-elevation areas of New Mexico and Colorado, spring through fall production is viable. Consistent irrigation is essential in arid conditions.

Tatsoi is well-suited to the Southwest's cool-season growing window. In the low desert, plantings made in October or November can produce through the winter and into early spring, though bolting may occur once daytime temperatures consistently exceed 75°F in March.

The long, warm Southwest season suits tomatillos well. Plants may slow during the hottest weeks but resume production as temperatures moderate. A reliable producer in both spring and fall windows.

The warm, sunny Southwest provides good tomato-growing conditions in spring and fall, but the peak summer heat often causes blossom drop when temperatures exceed 95 degrees. Production tends to pause in July and August and resume in September; planting in late February or early March to get a full spring crop before the heat is a common strategy in the low desert.

Fall and winter crop in the low desert. Sow from September through November and harvest through spring. The mild, dry winter climate produces clean roots with minimal disease pressure and extended holding ability in the ground.

The desert Southwest is among the best watermelon climates in the country. Heat is rarely a limiting factor; irrigation management during fruit ripening is the key variable.

The intense summer heat of the Southwest suits yardlong beans well, though consistent watering becomes critical when temperatures stay above ninety-five. Planting in April or early May to get vines established before peak heat, then providing afternoon shade or heavy mulch, can extend production through the hottest weeks.

Zucchini can be grown in spring and fall in the low desert, but summer heat above 95 degrees often causes poor fruit set and blossom drop. A spring planting timed to finish before peak heat, or a late-summer planting for fall harvest, tends to be more productive than trying to grow through July and August.

The intense heat of the Southwest suits basil's tropical origins, but plants may struggle in midsummer if temperatures stay above 95 degrees for extended periods. Afternoon shade during the hottest weeks and consistent soil moisture tend to keep plants in leaf production longer.

In the low-desert Southwest, bay laurel can be grown in the ground in zones 9 and above, where it tolerates heat and drought well once established. In higher-elevation areas with occasional hard freezes, it remains a container plant. The intense summer sun may scorch leaves; afternoon shade during the hottest months tends to prevent damage.

In the low-desert Southwest, borage is best grown as a fall, winter, and spring crop. Sowing in September or October allows the plant to flower during the mild winter months; summer heat typically causes it to decline or die back entirely.

In the low-desert Southwest, chamomile is best grown as a winter or early-spring crop. Sow in late fall or very early spring; the plant will bloom before summer heat arrives and die back in May or June.

Chervil is well-suited to winter gardening in the low-desert Southwest, where it can be sown in October and harvested through the cool months. Spring and fall sowings in higher-elevation areas may succeed if given afternoon shade and consistent moisture.

In mild winter climates, chives can be productive year-round. In the low desert, they do best in fall through spring; plant in a spot with afternoon shade in summer. Garlic chives may handle summer heat somewhat better than common chives.

Cilantro is primarily a fall, winter, and early spring crop in the Southwest low desert. Sowings from September through February tend to perform well, and the plant may produce through April before bolting. Summer heat makes growing cilantro nearly impossible without significant shade and cooling.

Dill is primarily a cool-season crop in hot desert climates. Plant in fall or late winter for winter and spring harvest. Summer heat causes rapid bolt. In coastal Southern California, it can grow nearly year-round with some attention to variety selection.

The intense summer heat of the low desert Southwest tends to shut down French tarragon production from June through September. Growing it as a fall-winter-spring herb and taking it through the hot months in a shaded or partially shaded location can extend its useful season.

In the low desert, growth is strongest from fall through spring; give afternoon shade and steady drip irrigation in summer. Garlic chives tolerate the heat better than common chives. Higher-elevation gardens can grow it like the rest of the West.

In the low desert, plant out after your last frost and harvest before peak heat, or give afternoon shade and steady drip irrigation through summer. Spider mites are the main pest in dry heat. Higher-elevation gardens can grow it as a regular summer crop.

Coastal Southern California and the low desert offer ideal lavender conditions for most of the year. In the low desert (zone 9–10), lavender can struggle in peak summer heat — afternoon shade may help. Water deeply and infrequently. The dry, alkaline conditions suit it well and plants can become substantial shrubs over several years.

In hot desert climates, lemon balm needs afternoon shade and consistent moisture. It tends to do best in the cooler months of fall through spring. In coastal Southern California, it can persist year-round in partial shade.

In the low desert, lemon verbena can stay outdoors year-round in zones 9 and 10, though it may defoliate briefly in winter. Afternoon shade during the hottest months and consistent watering prevent stress. In cooler high-desert areas, bring it indoors by late October.

The intense heat and long growing season of the low-desert Southwest suit lemongrass well, and it can often be left outdoors year-round in the warmest areas. Consistent watering is essential during the hottest weeks to prevent the plant from slowing growth.

Lovage is poorly adapted to the heat and aridity of the Southwest, particularly in low-desert regions. It may survive with heavy irrigation and afternoon shade, but it tends to bolt early and decline by midsummer — cooler, moister climates are much more favorable.

In hot desert climates, mint appreciates afternoon shade and consistent moisture. It can grow year-round in mild areas of Southern California and coastal zones. In low desert, plant in a shaded spot with regular irrigation.

In hot desert climates, oregano may struggle through summer heat but often rebounds in fall. Give it afternoon shade in zones 9 and above. In mild coastal Southern California, it can grow as a long-lived perennial with almost no care.

Treat as a cool-season herb. In low-desert climates, plant from October through February and expect harvest through spring. Hot summer temperatures cause rapid bolt. Afternoon shade is helpful in zones 9 and above.

One of the best climates for rosemary. In zones 8–10, it grows into substantial shrubs and blooms heavily in winter. Water deeply but infrequently. In the low desert, plant in fall for establishment before summer heat.

In hot desert climates, sage may look rough in peak summer but can persist as a long-lived perennial in zones 7–9. Give it afternoon shade in zones 9b and 10. In coastal Southern California, it can grow into a substantial shrub with minimal care.

In the low-desert Southwest, shiso can be grown in spring, fall, and winter, but may struggle in peak summer heat. Planting in partial shade and providing consistent moisture extends the productive period. Self-seeding can occur in milder winter areas if plants are left to flower.

In the desert Southwest, sorrel performs as a cool-season green — planted in fall for winter and spring harvest in zones 8–10. It does not tolerate the intense summer heat of Phoenix or Tucson. In higher-elevation areas (Flagstaff, Santa Fe), it may overwinter and perform more like a perennial.

The intense heat and long growing season of the low-desert Southwest are ideal for stevia, and the plant can produce very sweet leaves if given consistent water and some afternoon shade during the hottest weeks. In cooler high-desert areas, the plant performs better but may require season extension to reach full maturity.

The hot, dry Southwest is nearly ideal for marjoram — the plant tolerates heat well and the low humidity reduces disease pressure. Afternoon shade during the peak of summer may help extend the harvest period in low-desert areas.

Handles heat and alkaline soils well. Water deeply but infrequently. In low desert climates, plant in fall for a spring harvest and expect some dieback in peak summer. Coastal Southern California is among the best climates in the country for long-lived thyme.

Most of the Southwest lacks sufficient winter chill for standard apple varieties, though low-chill types bred for warm climates can succeed in higher-elevation areas. Fire blight and sunscald on exposed bark are common challenges.

Blackberries struggle in the intense heat and low humidity of the low-desert Southwest; they are better suited to higher elevations or more temperate coastal zones. Where they do grow, irrigation management is critical — the plants need consistent moisture but will develop root rot in poorly drained soils.

Desert Southwest soils are typically alkaline and unsuitable for blueberries without major intervention. Southern highbush types in containers with acidified potting mix can succeed in zones 8–9 in milder desert areas. This is one of the more difficult fruits to grow well in this region.

Most of the low-desert Southwest does not provide the winter chill hours that cherries require, and summer heat can stress the trees. Higher-elevation areas in New Mexico and Arizona can grow cherries successfully, though late frosts and dry air can create challenges during bloom. Sour cherries tend to need slightly fewer chill hours than sweets.

The hot, dry summers of the Southwest are poorly suited to currants, which prefer cool, moist conditions. Gardeners in high-desert or mountain areas may have success with heavy mulching and consistent irrigation, but low-elevation gardens typically find currants unproductive.

Elderberry is not well-suited to the arid Southwest unless consistent irrigation is available. The high water requirement and preference for cool roots make it a poor fit for hot, dry climates, though it may succeed in riparian zones or with heavy mulching and drip irrigation.

The warm, dry climate of the Southwest is ideal for fig production. Low humidity reduces leaf rust and fruit splitting, and the long season allows both breba and main crops to ripen fully. Figs can tolerate desert heat but benefit from deep watering during fruit development.

Gooseberries are poorly suited to the hot, dry Southwest and rarely thrive below Zone 7. The plants need winter chill and cool roots, neither of which the low desert provides. High-elevation gardens in northern New Mexico or Arizona may have success if the site is shaded and well-watered.

The hot, dry Southwest suits certain vinifera varieties well, particularly in California and parts of Arizona and New Mexico with adequate irrigation. Desert heat can be excessive for some varieties; choosing heat-tolerant types and providing afternoon shade in the hottest climates may be necessary.

Mulberries can perform well in the Southwest with supplemental irrigation, particularly in higher-elevation areas. In the low desert, the extreme summer heat may stress trees, and providing afternoon shade and consistent water during fruit development tends to improve yields.

The hot, dry Southwest is not suitable for pawpaws, which evolved in moist forest understories. The combination of low humidity, alkaline soils, and intense sun tends to stress the trees beyond recovery.

Low-desert areas of the Southwest lack sufficient chill hours for most standard peach varieties. Low-chill cultivars bred for mild winters are necessary, and even those may struggle with the extreme heat of June and July, which can sunburn fruit and stress the tree.

Low-desert areas generally lack the winter chill hours that European pears need to fruit well — most require 600–900 hours below 45 degrees. Higher elevations in Arizona and New Mexico can grow pears successfully, though late spring frosts can damage blossoms.

The dry climate of the Southwest reduces brown rot pressure significantly, but plums still need consistent irrigation to develop good fruit size. Low-chill Japanese varieties can perform well in the low desert, though they may need afternoon shade during peak summer heat.

Raspberries struggle in the desert Southwest's heat and alkaline soils. In higher-elevation areas of New Mexico and Arizona (above 6,000 feet), conditions can support raspberries. In lower elevations, they are generally not well-adapted.

In the low-desert Southwest, serviceberry struggles with intense summer heat and may require afternoon shade and consistent irrigation. It performs better in higher elevations or northern parts of the region where summer temperatures stay below ninety degrees most days.

In the desert Southwest, strawberries are typically planted in fall for late winter and spring harvest in zones 8–10. Summer heat is too intense for most varieties to survive. Day-neutrals like Seascape and Albion can perform well in coastal southern California year-round.

Bee balm can be challenging in the hot, dry Southwest without supplemental irrigation. It tends to perform better in higher-elevation gardens or in spots with afternoon shade. Mildew is less of a problem in the arid air, but keeping the soil consistently moist in summer heat requires attention.

Butterfly weed can perform well in the Southwest in areas with sufficient winter chill, though the extreme summer heat of the low desert may stress it. Planting in a spot with afternoon shade and supplemental water during the hottest months can help. The well-drained soils common in the region are ideal.

In the desert Southwest, calendula performs as a cool-season annual. Plant in fall for winter and early spring bloom in zones 8–10. In zone 7 (such as Albuquerque), plant in early spring. It tends to collapse in summer heat above 90°F.

In the desert Southwest, cosmos tends to perform best in spring and fall rather than peak summer. Afternoon temperatures above 100°F can cause blossom drop and wilting. Plant early in spring, mulch well, and consider a second round after the intense heat breaks in September.

The heat and low humidity of the Southwest do not suit garden phlox well; it tends to struggle in summer and may not bloom reliably. Gardeners in the region often have better results with heat-tolerant native penstemons or salvias.

Lupines are generally not suited to the Southwest — the intense heat and often-alkaline soils work against the plant's requirements. In higher-elevation areas with cooler summers and acidic soil, they may be possible, but most gardeners in the region will find the effort frustrating.

In the desert Southwest, marigolds are often planted in spring and again in fall, avoiding the most intense midsummer heat. Afternoon temperatures above 100°F can cause petal scorch and reduced blooming. Mulch well and provide consistent water.

Morning glories can struggle in the extreme heat of the low desert, with flowers closing earlier in the day when temperatures exceed 95 degrees. Planting on an east-facing trellis for morning sun and afternoon shade tends to extend the bloom window in midsummer.

In desert climates, nasturtiums perform best in spring and fall. They tend to collapse in peak summer heat above 95°F. In Phoenix or Tucson, plant in early spring and again in September. Provide afternoon shade during the hottest months and water consistently.

The mild winters and hot summers of the low-desert Southwest make peonies difficult to grow successfully. The plants typically lack sufficient chilling hours to set buds, and summer heat can stress them. Higher elevations in Arizona and New Mexico may have more success.

Purple coneflower can be grown in the cooler, higher-elevation areas of the Southwest but struggles in the low desert, where extreme heat and alkaline soils challenge establishment. Afternoon shade and supplemental water during the hottest weeks may help in marginal zones.

The intense heat of the low-desert Southwest makes snapdragons primarily a winter and early-spring crop. Sowing in October or November for bloom from January through March tends to work better than trying to grow them in summer, when temperatures above 95 degrees cause near-total dormancy.

Sunflowers are well-suited to the hot, dry conditions of the Southwest and tend to bloom reliably with minimal irrigation once established. The heat can cause very rapid growth, and plants may need occasional deep watering during extended dry spells to prevent wilting, especially when the flower heads are forming.

In the low-desert Southwest, alyssum can be grown as a fall, winter, and early spring flower, blooming from October through April. Summer heat typically kills plants outright, but a late-summer sowing timed to germinate as temperatures drop can produce a heavy fall display.

In the low-desert Southwest, sweet peas are typically sown in fall for winter and early spring bloom. The season ends when temperatures exceed 85 degrees, which can be as early as April in some years. High-desert gardens with cooler summers can sow in early spring.

The dry heat and intense sun of the Southwest suit coreopsis well — it is one of the few perennials that actually prefers lean, fast-draining soil. In the low desert, planting in fall and treating it as a cool-season perennial often works better than expecting summer bloom in 100-degree heat.

Zinnias thrive in desert heat but may need more frequent watering than in other regions. Mulch around the base to retain soil moisture. In Phoenix or Tucson, plant in spring and again in late summer to avoid peak summer temperatures above 105°F, which can cause blossom drop.

The intense heat of the low-desert Southwest may stress buckwheat during midsummer, and the crop is better suited to spring or fall planting when temperatures are more moderate. The low water requirement makes it a good choice for dryland farming in higher-elevation areas.

In the low-desert Southwest, crimson clover can be sown in fall and grown through the mild winter as a cool-season cover. Termination typically happens in March or early April before summer heat arrives. Supplemental irrigation is usually necessary in the dry desert climate.

In the low-desert Southwest, field peas are typically fall-sown for winter growth and terminated in early spring before the heat of late April and May. Summer sowing is not practical due to heat stress.

Hairy vetch can be grown as a winter cover crop in the low desert and lower-elevation valleys of the Southwest. Fall sowing in October or November allows growth through the mild winter, and termination typically occurs in April before summer heat. Irrigation may be needed if winter rains are sparse.

Oats are rarely used as a winter-killed cover in the low-desert Southwest, where winters are too mild for reliable kill. They can be grown as a cool-season grain or forage crop with irrigation, but other cover options tend to fit the climate better.

In the low-desert Southwest, tillage radish can be sown in late summer or early fall and grown through winter as a cool-season cover. The lack of a hard freeze means the crop must be mowed or tilled under before it bolts in spring, or it will reseed aggressively.

The hot, dry summers of the low-desert Southwest are difficult for white clover, which tends to go dormant or die back completely in June and July. Fall planting and consistent irrigation can keep stands alive, but other leguminous cover crops adapted to heat may perform better in this region.

In the low desert, winter rye can be grown as a cool-season cover crop sown in October or November, but the mild winters mean it grows actively all season and may need to be terminated earlier — February or March — to avoid excessive water use before spring planting.