Milky White Substance
I have recently let my red leaf lettuce grow too much, and now the leaves are hard and there is milky white liquid that is coming from the stalk when I cut it. What is this, and is it still ok to eat the lettuce after it's gone to seed?
Certified GKH Gardening Expert
It is safe to eat but when lettuce goes to seed, it develops a bitter flavor and does not taste good. The milky substance is just the juice, or sap, of the mature plant.