45-60 days. Introduced in the 1870's by Peter Henderson & Co. Sweet.   A very nice loose-leaf, tender leaves, light yellow-green variety; very popular. 

Contains approx. 100 heirloom seeds

Pick Black Seeded Simpson lettuce as soon as it is big enough to use. We recommend harvesting with a clean, sharp scissors. The plant will re-grow. But, after a while, it's good to have a vigorous new patch to harvest from.