I have a head but no body, a heart but no blood. Just leaves and no branches, I grow without wood. What am I?

Why this works

This riddle plays with the different meanings of words related to the parts of a plant. The "head" refers to the top part of the lettuce, often called a "head" of lettuce, while "heart" describes the inner, tender core of the lettuce that is sometimes referred to as the "heart." The phrase "just leaves and no branches" highlights that lettuce consists primarily of leaves, with no woody structure, making it a fun and clever way to describe this common vegetable!