Lettuce is a plant with a short attention span. Given cool weather and consistent moisture, it grows fast and produces tender leaves for weeks. Given warm nights and lengthening days, it sends up a flower stalk, turns bitter, and stops being worth eating. Most home gardeners plant lettuce once in April, harvest it in May, and then watch it in June. The crop is finished by the time summer really begins.
The fix is — planting a new row or bed every two to three weeks from early spring through late spring, then pausing through the hottest part of summer and resuming in late summer for fall harvest. Each planting gives you two to four weeks of good leaves before it starts to think about flowering. A gardener with four small plantings spread across eight weeks tends to have fresh lettuce from April through June, and again from September through frost.
Bolting is the thing that catches new gardeners off guard. One week the plant looks fine; the next week there's a tall central stalk pushing up, the leaves have turned leathery, and the flavor has gone from mild to unpleasantly bitter. This is not a disease or a mistake — it's the plant's reproductive instinct, triggered by a combination of warm nights, long days, and sometimes root crowding. Once a lettuce plant bolts, the leaves are done. Pull it and plant something else.
Loose-leaf varieties tend to be more forgiving than head lettuce in a home garden. A loose-leaf plant can be harvested leaf by leaf over several weeks; a head lettuce is an all-or-nothing proposition — you wait for the head to form, and if it bolts before that happens, you get nothing. Loose-leaf types also tend to tolerate heat a bit longer, though they'll still bolt eventually.
Afternoon shade becomes important as the season warms. Lettuce sown in early spring can handle full sun, but lettuce growing in May or early June often benefits from being planted where taller crops — tomatoes, trellised peas, a row of sunflowers — will cast shade in the hottest part of the day. A few hours of afternoon shade can delay bolting by a week or more, which matters when the harvest window is narrow to begin with.
The fall crop is often the best crop. Lettuce sown in late summer matures in cooling temperatures, and the leaves tend to be sweeter and more tender than anything you grew in spring. In many climates, fall lettuce can be harvested well into November or even December if you protect it with during hard frosts. A plant that would have bolted in three weeks in June can sit in the garden for two months in October.
Varieties worth knowing
Growth habit — pick before you buy seed
The same crop can grow as a compact bush, a sprawling vine, or something in between. Choose the habit that fits your space and how you want the harvest to arrive — all at once, or a steady trickle.
Forms a dense central head. Crispheads (iceberg) are longest-storing; butterheads are tender and fast.
No head — just a loose rosette. Harvest outer leaves or cut the whole plant 1 inch above soil and it regrows.
Upright elongated head with sturdy leaves. Heat-tolerant compared to most heading types.
What can go wrong
Companions
How to propagate
Lettuce is one of the easiest vegetables to grow from seed and germinates quickly in cool conditions. It can be direct sown outdoors or started indoors for transplanting.
Harvest & keep
Cool-season — bolts fast above 75°F. Succession sow every 2 weeks in spring and fall.
- Refrigerator
- 7–14 days (heading); 5–7 days (loose-leaf, washed and dried)
- Freeze
- not recommended — becomes limp mush
- Can
- not recommended
- Dry
- not recommended
Wash, spin dry, roll in a towel, bag — keeps 2–3x longer than pre-washed greens.
How it grows where you live
Sources
- Growing lettuce in home gardens— University of Minnesota Extension
- Lettuce— Clemson Cooperative Extension HGIC
- Lettuce production— Penn State Extension
- AphidSoft, clustered insects on new growth causing curled leaves and sticky honeydew.
- Gray Mold (Botrytis)Gray-brown fuzzy mold on fruit, flowers, or stems — soft, collapsing tissue beneath the coating in cool, wet conditions.
- Cabbage LooperRagged holes in brassica leaves made by a pale green caterpillar that loops its body as it moves.
- Crown RotThe base of the plant turns brown and soft at the soil line, and the plant collapses — caused by wet-soil pathogens attacking the crown.
- CutwormTransplants severed at the soil line overnight; fat gray caterpillars curl in the soil beneath.
- I have aphids on multiple plants — do I need to spray everything?Aphids tend to colonize plants under stress and naturally crash when beneficial insects find them — water sprays and patience are often more effective than pesticides.
- What causes tip burn on lettuce or brown inner leaves on cabbage and other greens?Tip burn on lettuce and internal browning on cabbage are caused by localized calcium deficiency in the fastest-growing inner tissue — the same mechanism as blossom end rot, but in leafy crops.
- Something is cutting off my seedlings at the base overnight — what is it?Cutworms — fat gray or brown caterpillars that live in the soil and feed at night — cut young stems at or just below the soil surface, and a simple collar around each stem can stop them.
- Deer are eating my garden — what actually works to stop them?An 8-foot fence is the only reliably effective deer deterrent — repellents and shorter fences work temporarily but tend to fail when deer are hungry enough.
- What are the white or tan papery patches appearing on my leaves during a heat wave?White or tan dry patches on the upper surface of sun-exposed leaves are heat scorch — the leaf tissue has been killed by a combination of excessive temperature and direct solar radiation.