Most toxic plant reactions cause skin problems of some kind. Nuss says awareness and common-sense precautions can prevent most problems. Samples will help your doctor identify the cause of the problem. Nuss recommends that gardeners learn to identify problem plants. If exposed, gardeners should wash thoroughly as soon as possible.
Oils can spread toxins and promote skin absorption.
Detergents or hand cleaners are the most effective. Nuss lists some of the common plants that can have toxic or harmful effects on humans. The fruit of the ginkgo tree and the sap of the smoketree also can cause skin rashes. Most allergic reactions are caused by pollen, bringing on hay fever or asthma. Mold spores can cause allergic reactions in sensitive individuals, as can some lichens that grow on rocks or trees.