Lettuce (Headed) Growing Guide Lactuca sativa Crop Rotation Group Miscellaneous ● Soil Most soil types but best if it's moisture retentive with some dug in compost. Position Semi-shade, a cool sunny spot or inter-planted between other crops. Frost tolerant No. Feeding Not usually required. Spacing Single Plants: 25cm (9") each way (minimum) Rows: 20cm (7") with 30cm (11") row gap (minimum) Sow and Plant Early planting can be done under cover in modules or under cloches outside. Continue sowing outside every few weeks for a continous supply. Our Garden Planner can produce a personalised calendar of when to sow, plant and harvest for your area. Notes Early sowings are easily attacked by slugs and snails, so may be best in containers. Thin out to give plenty of room for each plant to grow. In hot summer conditions lettuce can bolt (produce flower heads) and becomes tough and a little bitter. Harvesting When the heart of the lettuce feels firm pull the whole plant up and cut off the roots. Harvest in the morning when the leaves are cool and full of moisture. Planting and Harvesting Calendar < Back to All Plants Pests which Affect Lettuce (Headed) Aphids (General) Cutworm Leaf Miner Slug Snail Plant Diseases which Affect Lettuce (Headed) Cucumber Mosaic Virus Lettuce Downy Mildew Lettuce Leaf Drop Lettuce Mosaic Virus