Black Seeded Simpson Organic Lettuce Seeds 4090 Heirloom Vegetable. Black Seeded Simpson is an old variety originating in 1875. It has been a favourite ever since! Extra large, wrinkled and crumpled bright green leaves are very appealing to both the eye and the palette. This lettuce is very well adapted to a wide range of growing conditions and it is one of the best to sow early and often!