Deadly plants – These plants could kill you: Plants bring our gardens to life, and many are used to produce medicinal drugs. But there are some plants that can kill you. Literally. And, as you’re about to see, you can’t always judge a plant by its cover: eating the seeds, fruit, or leaves, for example, of a completely harmless-looking specimen could leave you dead within hours.Most of the following information can be found online at the Canadian Poisonous Plants Information System.