Here we call them Moonflowers. And yes they are poisonous BUT if you are that dumb to eat or otherwise try to get HIGH then you are just dumb. Rhubarb(leaf) is poisonous, foxglove, narcissus, ... the list goes on. That's why they are bitter so we know NOT to eat them. Enjoy the blooms and the fact they come back. For some reason mine did not winter over so I have to baby the one I have so I can get it to seed over for next year.