What's so great about growing lettuce?  Well, with leaf lettuce, it seems the more you cut the more it grows.

Lettuce is mainly a cool-season crop but there are three types:  cold weather (Arctic King, Brune d’ Hiver, Rouge d’ Hiver, Winter Marvel), cool weather (Buttercrunch, Four Seasons, Lollo Rosso, Romaine, Royal Oakleaf, Tom Thumb), and heat tolerant (Black-seeded Simpson, Craquerelle du Midi, Red Riding Hood, Red Sails).   I am currently growing Romaine.