Know your lettuce: from seed packet to salad

Choose your lettuce

Choose for the texture you like and the way you want to harvest. A type describes the plant’s form; a variety is its particular name.

Leaf lettuce

Open, ruffled leaves for a colorful salad or repeated outer-leaf picking. Try Red Sails, Ruby Red, or Gabriella.

Butterhead and Bibb

Soft leaves around a loose head. Compare Summer Bibb, Way-A-Head, Buttercrunch, and All Year Round.

Romaine

Upright leaves with crisp ribs. Choose Little Gem for small romaine-style heads or compare Red Romaine.

Lettuce mixes

Try several leaves from one packet: Allstar Gourmet, Gourmet Mixture, or Heatwave.

For speckled leaves, meet Flashy Trout Back. Crisphead, or iceberg, forms a tight head and generally needs a longer cool growing period. Leaf lettuce is a useful place to begin when your goal is a small, early harvest.

Plant in your cool season

In cold-winter areas, lettuce often fits spring and late summer into fall. Warm-winter gardens commonly use the cooler fall and winter months. Match your local vegetable calendar, forecast, and variety’s growing time.

A name such as “Heatwave” or “All Year Round” describes a variety or mix; your weather still sets the planting window. A USDA hardiness zone describes winter cold, not the whole vegetable-growing season.

Sprinkle a small pinch of seeds

1. Fill your draining bowl with about 3 inches of potting mix. Leave a little room below the rim. Wet the mix so it feels like a damp sponge.
2. Sprinkle a small pinch of seeds across the surface. Spread them out; avoid little piles. Save the rest of the packet for another planting.
3. Press the seeds gently onto the mix. Lettuce seed needs light to help it sprout. Leave it at the surface, or use only the very thin dusting of mix your packet calls for.
4. Water with a fine spray or gentle trickle. Add a label with the name and date. Check each day so the surface stays damp without being soaked.
5. In mild conditions around 60–70°F, sprouts often appear in 7–14 days. Hot conditions can slow or stop sprouting.

You are growing young leaves close together, so you do not have to make one perfect planting hole for each seed. Give them room to come up without crowding into a clump.

Once green leaves appear, they need good growing light. A tray baking in hot sun can dry out quickly. Check your little bowl often.

Keep your little bowl growing

When the sprouts crowd together, snip out extras so the plants left behind are about 1–2 inches apart. This is thinning. Use small scissors at the mix surface so you do not pull up nearby roots.

Check the mix each day. Shallow containers dry faster than deep pots. Water gently when the surface starts to dry, and let extra water drain. Do not leave the bowl sitting in water.

If your potting mix already has plant food, follow its label. If it has none, use a fertilizer labeled for vegetables and follow its directions for containers. A small bowl needs careful measuring.

Indoors, watch the plants. Tall, weak stems leaning toward a window need more light. A grow light is a lamp made to help plants grow; follow its distance and timing directions.

Want one larger plant instead? Use a pot at least 8 inches deep, with drainage holes. Keep one plant in a pot about 12 inches wide. In a bed, individual leaf lettuce plants commonly need 4–8 inches between them. The shallow bowl plan above is for young leaves picked close together.

Growing help: Maryland Extension: growing greens in shallow boxes.

Read the plant before changing the plan

• Tall, thin, leaning seedlings: improve the light.
• No sprouts: check depth, surface moisture, temperature, and elapsed time.
• A rising flower stalk: the plant is bolting. Heat and longer days can encourage this, and leaves may become bitter.

Change one thing at a time and keep a short note. Learning your setup is part of growing, Cousin.

Cut and come again: leave some to grow more

You can eat a little lettuce without pulling up the whole plant. Cut and come again means you cut leaves, keep the roots and base in place, and give the plants time to make more.

For your baby-leaf bowl

1. Let the leaves reach about 4–6 inches tall. In good conditions, this often takes about 3–6 weeks from planting.
2. Use clean scissors to cut the leaves about 1 inch above the mix. Leave the base of each plant and its roots in place.
3. Rinse the picked leaves under running water before eating. Keep caring for the bowl with light and gentle watering.
4. Wait for fresh leaves to reach a useful size before cutting again. A second picking may take another 3–4 weeks. Sometimes you get a third; heat, light, and plant health affect that.

For one larger lettuce plant

Pick a few outer leaves and leave the small center leaves growing. Leave plenty of healthy leaves on the plant. Come back after it grows more.

Both methods can stretch a planting. They do not keep one bowl growing forever. When plants turn bitter, send up a flower stalk, or stop making good leaves, start a fresh small batch. Planting another bowl while the first grows gives you a next crop to look forward to.

Harvest help: Maryland Extension: cutting height and repeat harvests.