Step 1: Make Drills in Soil for Lettuce Seeds
Long, slim pots or fabric bags fit snugly onto a windowsill and look attractive with woven willow surrounds. Fill them with compost to about ½in (1cm) below the rim and make drills ¼in (½cm) deep and about 2in (5cm) apart.
Step 2: Sow Lettuce Seeds Along Prepared Drills
Pour seed into the palm of your hand and sprinkle it into each drill using your thumb and index finger. Cover the seeds lightly with compost and water thoroughly using a can with a fine rose to avoid disturbing the seeds.
Step 3: Water and Harvest
Keep the compost moist and when the seedlings are 2–4in (5–10cm) in height, cut them as required, about 1in (2.5cm) above soil level. The plants should then sprout new leaves which can be harvested about two weeks later.
Step 4: Continue the Cycle
Loose-leaf lettuce cultivars and many other types of salad greens, such as mizuna and arugula, respond well to being sown quite thickly, the baby leaves cut, and the stumps allowed to regrow two or three times. Alternatively, allow the tender leaves to grow longer and snip off as required; more leaves will then grow.