LETTUCE WINTER DENSITY ~ a very versatile little lettuce enjoy sweet hearts in March and April and sow for a summer of flavour too 75 seeds SOW: September to November for picking in March and April. Sow from April onwards for a succession through the summer. GROW: In the summer keep them watered in dry weather and watch out for slugs and snails – they love lettuces! These are hardy superstars through the winter and should not need any extra looking after! EAT: Fresh in salad – enjoy the flavour on its own or try mixing with a range of other salad choices. Winter Density can be used in cooked dishes so no need to keep for salads when the weather is cold!