To defend themselves against pests, several plant species have learned in the course of evolution to produce defensive substances of various kinds, which can also create more or less serious problems for humans. Often, these are of “simple” irritating or stinging compounds that, when they enter the contact with skin or mucous membranes, cause allergic or irritative dermatitis, burn-like lesions or diffuse swelling or itchy pomphi. Sometimes, however, these are real plant toxins that act as poisons to the human organism, even endangering life if accidentally ingested (for example, because toxic berries are mistaken for edible fruits or Because a child puts its leaves in his mouth without knowing the dangerousness). Some poisonous plants are very common and used for the purpose of ornamental in homes and gardens: Find out which ones to watch out for.
