Poison Ivy Early. Poison sumac also has a curious white berry. When they ripen (in late summer to early fall), they turn from a pale green to a whitish color.
Avoiding contact with the poison ivy plant is the best prevention. Poison ivy is a weed commonly found growing in yards, along roadsides, in forests, and even in urban areas in North America. The reaction is caused by oil from the plant.
Washing the skin after touching the plant can prevent a rash.
Poison ivy is usually green in the spring and reddish-orange in the fall.
This rash, known as contact dermatitis or rhus dermatitis, is actually. The rash doesn't usually spread unless urushiol is still in contact with your skin. The reaction is caused by oil from the plant.