When plants come up, they can be grown under fluorescent lights or next to a sunny window until frost is done for the season ...

How to grow romaine lettuce from seed Transplants of young ... In warmer climates, sow seeds outdoors after the frosts and the soil is workable. Sowings in late summer and early fall can also ...

For lettuce to harvest over winter and into the following spring, sow in August or early September. For the best crops with the sweetest flavour, grow outdoors under fleece or insect-proof mesh, such ...