To harvest earlier outdoors, part of the plants can be covered with perforated foil.
This achieves an extension of the possible harvest period and avoids it at the same time, that too many ready-to-cut heads accumulate at once. Lettuce only lasts for a short time in its ready-to-harvest state, so that precise cultivation planning is required. You should only plant so much lettuce at a time, as within 10 to 12 days can be consumed. In order to always have ready-to-cut lettuce available and to use the numerous possibilities, which lend themselves to the cultivation of lettuce in the garden, are at intervals of 14 days of subsequent sowing. These can be done on outdoor seedbeds from the end of March. The last sowing date for outdoor crops from late September to early October is between the 10. and 15. July.