Correction: What are the names of plants which are very bad for health if you eat them? Don't eat any plants which you don't recognise, for example certain types of mushrooms, berries or the leaves of rhubarb.

I agree with Lynne. Jose Ramos from Mexico.

It's possible you are thinking of oleander.

some kınd of mushrooms may contaın many poıson ın ıts,we must be carefull.

Arucard303 is correct but "poisonous" means you get sick or die. Less strong is "allergic" which is more common as a reaction to eating something (not always). We need to do something about that grammar of yours. I recommend throwing it overboard. Good Q, keep sailing.