Some leaves turn yellow-green, pink or reddish. The flowers turn into small white or tan berries. The fruit becomes darker, dried and wrinkled.
Leaves turn bright red or russet brown.
Poison Oak in the Winter Leaves and seeds fall, leaving stick or whip-like stems or climbing vines. New Growth of Poison Oak New growth may sprout during spring or a warm winter. They are usually small, round, and a deep red. Despite the usual seasonal colors, leaves may be yellow, pink, brown, red, or various combinations. It actually contains an oil that most people are allergic to, though animals are not.