Pick individual outer leaves or wait to harvest full heads.
For ongoing harvest, you can begin harvesting once the leaves reach about 4 inches tall. Harvest the outer leaves of the head and let the inner leaves continue to grow and mature. Just snip either single outer leaves or grab a bunch of them and cut them with scissors one inch above the base of the plant. Be careful; if you cut into or below the base, the plant may die, so leave the small leaves in the middle to regrow easily.
Do not cut more than a third of the plant in you want it to keep growing
Lettuce was harvested by the ancient Egyptians, who passed it on to the Greeks and then the Romans who brought it to Europe.
Red Sails has more Vitamin C than other lettuce varieties.