Cos lettuce
Cos lettuce (Lactuca sativa var. longifolia) is a plant. It grows best in full sun and has moderate water needs. It grows well with beet, onion and cucumber.
About Cos lettuce
Cos lettuce is an annual plant that grows 90 cm tall. It is self-fertile, so you only need one.
The flowers attract pollinators.
How to plant cos lettuce
Cos lettuce does best in full sun, but also copes with part shade. It grows in sandy soil and loam, as long as the soil is well drained. It does best at a pH of 6–7. In a forest garden it belongs in the herb layer.
Plant plants 20 cm apart. It struggles in compacted soil, so keep the soil loose.
A year with Cos lettuce
Spring. Water during dry spells in April–October. Keep the ground around it weed-free in April–October.
Summer. It has yellow flowers in July. Sow seed in August–October.
Autumn. Protect it from slugs and snails in September.
Winter. Sow seed in January–March.
Pests and diseases
Cos lettuce can be attacked by cutworms, wireworms, nematodes, tarnished plant bugs, aphids and leafhoppers. Diseases include big vein, mosaic virus, aster yellows, powdery mildew, downy mildew and bottom rot.
Companions and wildlife
Cos lettuceThe family
Cos lettuce is a variety of Lettuce, in the genus Lactuca. Open a species to see what lies under it.
Cos lettucevar. longifoliaThis pageSources
Added to the wiki 12 October 2026
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