How to harvest Cos Lettuce
Leaves are harvested individually or as a whole plant. The plant is ready to harvest 60 to 70 days after planting. Harvest before a central stem forms. If temperatures are too high the plant will bolt forming a central stem with flowers and eventually seeds.
How to propagate Cos Lettuce
Sow seeds in seed trays at a depth of 0.6 to 1.3cm. The optimal temperature for germination is around 20 °C. Transplant after 4 to 6 weeks.
If the whole plant is harvested and the base of the plant is kept in a bowl of water, the centre of the plant will continue to grow and form new leaves.
Special features of Cos Lettuce
To prevent soil diseases, follow lettuce planting with dwarf beans, carrots, cucumbers, squash or basil.
Popular to grow in greenhouses or tunnels.
Salads are easily to grow in a hydroponic set-up.
Other uses of Cos Lettuce
Leaves are eaten mostly raw, but can be cooked too.