6 doctors weighed in:

What months is poisen oak active in california? Is it all year?

6 doctors weighed in
Dr. Ralph Morgan Lewis
Family Medicine
5 doctors agree

In brief: Poison oak belongs

To toxicodendron family (oak, ivy, sumac).
The irritant oil (urushiol) is found in leaves, stems, flowers, berries, roots & is active year round. If removing it, wear protective clothing that can be thoroughly washed or disposed of. If burning plants, stay well up-wind, as inhalation can cause respiratory emergency. Herbicides may be best way of destroying plants.

In brief: Poison oak belongs

To toxicodendron family (oak, ivy, sumac).
The irritant oil (urushiol) is found in leaves, stems, flowers, berries, roots & is active year round. If removing it, wear protective clothing that can be thoroughly washed or disposed of. If burning plants, stay well up-wind, as inhalation can cause respiratory emergency. Herbicides may be best way of destroying plants.
Dr. Ralph Morgan Lewis
Dr. Ralph Morgan Lewis
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