yes, and did you know that most of the poisoness plants are among some of the most beautiful. have you ever seen monkshod? it is one of the most beautiful plants(my opinion) i have ever seen. i wont have it in my yard because of my outside cats(even if the rub against it it could make them sick cause cats lick themselves) but maybe one day i will. i want some oleander too. the foilage is awesome to look at.
btw: if a small child eats a castor bean seed it could kill them, if an adult ate them it would make them seriously sick.