Some Japanese red maple trees have green leaves?

Japanese red Maple leaves turn from red to green when the intensity of light is decreased.

Most if not all varieties of red leaf plants lose the red color if the leaves are in a shaded area. Our trees are grown close together to conserve water and help keep plants standing.This causes the new upper most leaves to become very red and the leaves that are shaded by other leaves to become green. Once these trees are given more space the red color comes back.
For information about growing Japanese Red Maples click here.