Lettuce

The fastest payoff in the garden: salad in a month, harvestable for weeks, and happiest in the cool shoulders of the season.

Sow shallow and cool, thin hard, repeat every 10-14 days.

Direct sowing is the default: scatter seed on prepared soil and cover with no more than 1/8 inch - lettuce seed needs light to germinate. It sprouts in cool soil that would rot most seeds (down to 40°F), which is why it can go in a month before last frost. The catch is the other end: above ~80°F soil, the seed enters heat dormancy and simply waits, so summer sowings should be germinated indoors or pre-chilled.

Thin ruthlessly to spacing - 4-6 inches for leaf types, 8-12 for heads - and eat every thinning. Transplants work well too and buy 2-3 weeks on the season.

Water little and often, feed lightly, and fight the two enemies: slugs early, heat late.

Lettuce is shallow-rooted and nearly all water, so the care rule is the opposite of tomatoes: light and frequent beats deep and rare. Never let the bed truly dry - moisture stress is the #1 cause of bitter leaves and early bolting. A light nitrogen feeding every few weeks keeps growth fast, and fast is tender.

Slugs are the early-season enemy; patrol or bait from the seedling stage. Heat is the late-season one: once days push past 80°F, shade cloth extends the harvest by weeks, but bolting eventually wins - that's your cue for the next succession, not a failure.

Take outer leaves for a rolling harvest, or whole heads at maturity - always in the morning, always before bolting.

Two modes: cut-and-come-again - snap or cut the outer leaves an inch above the crown whenever they hit 4-6 inches, and the plant rebuilds from the center for three or four more pickings; or whole heads - cut at the soil line when the head firms up. Morning harvest matters more than it sounds: leaves are fully hydrated at dawn and stay crisp twice as long.

The moment you see the center start to stretch upward, harvest everything left - bolting turns the whole plant bitter within days.

Wash, dry hard, and refrigerate in a breathable container - a week for leaves, two-plus for tight heads.

Lettuce storage is a drying problem: wash leaves in cold water, then get them thoroughly dry (salad spinner, then a towel) - surface water is what turns leaves to slime. Store in the crisper in a container or bag with a paper towel to catch condensation. Loose leaves keep about a week; dense heads two weeks or more. Wilted-but-sound leaves revive completely with a 15-minute ice-water soak.

North: spring and fall crop with a summer gap. South: fall-through-spring staple with summer fully off.

Zones 3-5: the short cool summers that frustrate tomato growers are lettuce paradise - many gardens crop it nearly all season with a brief midsummer pause. Zones 6-7: classic two-season crop: early spring and again in fall, with shade cloth stretching both ends; fall crops can push into early winter under row cover. Zones 8-9: flip the calendar - lettuce is a fall-through-spring crop and summer is the off-season. Zones 10+: grow through the winter months; in the true tropics, lean on heat-tolerant romaines and Batavians, afternoon shade, and accept a shorter leaf harvest.

Bitterness and bolting are heat/water stress; holes are slugs; brown edges are tipburn from moisture swings.

Bitter leaves: heat or drought stress - water more evenly, add shade, and harvest mornings; slightly bitter leaves sweeten after 30 minutes in ice water. Sudden tall stalk (bolting): triggered by heat and long days; harvest immediately and resow a bolt-resistant variety. Ragged holes overnight: slugs - trap, bait, or patrol at dusk. Brown leaf edges (tipburn): a calcium-delivery hiccup from uneven moisture, same mechanism as tomato blossom end rot - steady the watering. Seeds won't sprout in summer: heat dormancy; germinate indoors and transplant into shade.

Mostly water by weight, but a top source of vitamin K and folate - and the darker the leaf, the denser the nutrition.

Lettuce is 95% water and nearly calorie-free, which undersells it: it's an excellent source of vitamin K, good folate and vitamin A (as beta-carotene), and its volume is exactly the point — it's the vehicle that carries a meal's worth of other vegetables.

The one rule worth knowing: color equals nutrition. Dark romaine carries several times the vitamin A and K of pale iceberg, and red-tinged varieties add anthocyanins on top. Garden lettuce also skips the days-in-transit nutrient decline of shipped greens — a real, measurable freshness advantage.

Beyond salad: wraps and cups, grilled romaine, and the French trick of braising the surplus.

Salad is the day job, and the craft is matching leaf to dressing: sturdy romaine stands up to thick Caesar; delicate butterheads want light vinaigrette; looseleaf mixes shine with little more than oil, lemon, and salt. Dry your washed leaves completely — dressing slides off wet lettuce.

Off the salad plate: butterhead and romaine leaves are the best wrap and taco-cup material in the garden; halved romaine hearts brushed with oil and seared cut-side-down on a hot grill for two minutes become smoky-sweet with crisp edges; and a bolting bed's surplus can be braised French-style with peas and butter or wilted into soup — the traditional answers to too much lettuce at once.

The easiest seed-saving in the garden: let one plant bolt and it hands you hundreds of seeds that come true.

Lettuce is the perfect first seed-saving crop: it self-pollinates before its flowers even open, so varieties come true with almost no isolation (10-20 feet between varieties is plenty), and one bolted plant yields many hundreds of seeds. Let your best, slowest-to-bolt plant flower — selecting your last bolter each year gradually breeds more heat-tolerant lettuce for your garden — and wait 2-3 weeks after the small yellow flowers for the dandelion-like fluff.

When half the seed heads show fluff, cut the whole stalk into a paper bag, dry a week, then crush and winnow - the seed is heavier than the chaff. Stored cool and dry, lettuce seed keeps 2-3 years. A single plant funds every succession sowing you'll make next year.

Folk tradition credits lettuce with calming properties via its milky sap; garden varieties carry only traces.

Lettuce's medicinal story is mostly historical curiosity: the milky sap (lactucarium) of its wild ancestor was used as a mild sedative — 'lettuce opium' in old pharmacopeias — and the Romans served lettuce at meal's end to invite sleep. Cultivated garden lettuce contains only traces of those compounds (you taste them as the bitterness in a bolted plant), so treat the sleepy-salad tradition as folklore with a kernel of chemistry rather than a remedy. Its genuine health contribution is simpler: vitamin K, folate, hydration, and being the reason the rest of the salad gets eaten.

From sacred Egyptian oilseed to Roman dinner ritual to the iceberg era - lettuce is one of our oldest vegetables.

Lettuce was first cultivated in ancient Egypt over 4,500 years ago — not for leaves, but for oil-rich seed, and tomb paintings show tall spear-like lettuces associated with the fertility god Min. Greeks and Romans bred it toward the table (our word comes from the Latin lactuca, for its milky sap), with Romans eating it to begin or end meals depending on the century's medical fashion.

Nearly every modern type — romaine (named for Rome), butterheads, looseleafs — existed in some form by the Middle Ages. The newcomer is iceberg, bred in the 1890s and named for the ice-packed rail cars that shipped it across America in the 1920s, trading flavor for durability — the trade your garden bed reverses.