Lettuce BLACK-SEEDED SIMPSON 125 seeds £1.50 Quantity: at £1.50 each Add To Basket Heirloom variety with tasty, large and crunchy leaves. Can be used as a cut and come again type. Sow seeds from February in seed trays and place in light at a temperature of 18°c. Sow in situ from mid April and thin to 25cm between plants. Transfer seedlings into modules or pots and transplant into cold frame greenhouse or outdoors a few weeks later. Lettuce requires a fertile moist soil. Planting distance 30 x 25 cm.