Lettuce - Green Leaves Mixed This mix is easy and quick to grow, even in containers. It is a tasty ready mixed salad with different shapes and textures. Sow outdoors thinly from March to August where they are to crop, 1.5cm deep, directly into prepared, fertile, moisture-retentive soil, which has been watered. For cut and come again baby leaves, allow 15cm between rows, or sow thinly, directly into 25cm pots with drainage holes. Early sowings may benefit from cloche protection. Seedlings usually appear in 7-14 days. No further thinning should be necessary. Keep moist. Regular sowings, made every two to three weeks, will ensure a continuous supply of leaves. Pick a few from each plant when approx. 10cm high. They will regrow for up to 4 'cuts.' Harvest from April to October. For mature lettuces, allow 25cm between rows and thin to 20cm apart. Harvest whole plants from May.