Poisonous plants are those plants or plant products which cause harmful effects on human or other animals or may cause death. However, plants that are poisonous in fresh condition but lose their toxicity when dried or cooked will not be considered as poisonous plants. The leaves , bark , flowers and fruits of these plants may contain toxins. Latex in many plants is very toxic. Forest animals also stay away from these trees. Not all plants are edible or touchable. The nettle irritates the skin , causing euphobia and poison ivy skin rashes.