Romaine Lettuce

Tall, crunchy upright cos lettuce with sweet hearts and firm ribs — the classic for Caesar salads.
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Romaine (cos) lettuce seeds — crisp, upright hearts

Romaine, or cos, lettuce grows tall, upright heads of crunchy, sweet leaves with a firm rib — the classic lettuce for Caesar salads and sturdy enough for the grill. It sits within our wider lettuce range in the leafy greens collection. New to growing? Our vegetable growing guide covers the basics.

Sow successionally for crisp hearts through the season — the calendar shows when.

How to grow romaine

Sow direct or in modules into cool, moist soil and keep it watered for crisp, unstressed hearts. Cut whole when firm, or take outer leaves as cut-and-come-again. Botanically it is Lactuca sativa.

Pick your lettuce type

For soft, sweet leaves grow butterhead; for fast pickings, loose-leaf salad mixes. Browse all lettuce and vegetable seeds.

Keen on crisp, sweet salad leaves all season long? Explore the wider range.

Related categories: Lettuce · Butterhead Lettuce · Salad Leaf Mixes · Leafy Greens · Lactuca sativa

At SeedsChoice, every order ships from Meppel, NL with fast EU delivery.

Frequently Asked Questions

What is romaine lettuce?
Also called cos, it forms tall, upright heads of crunchy, sweet leaves with a firm central rib.

When should I sow it?
From spring to late summer, sowing a little every few weeks for a steady supply.

Can I pick leaves individually?
Yes — take outer leaves as cut-and-come-again, or cut the whole head once firm.

Does it bolt in heat?
It can; keep it moist, give light summer shade and choose bolt-resistant varieties for hot spells.