Looks can be very deceiving, especially when it comes to plants. They may look stunning and approachable, but be warned, the nicer the plant the more dangerous it tends to be.
Angels Trumpet (Brugmansia)
Angels Trumpet is a beautiful plant. Despite its name, this is not a plant you want to find yourself ingesting. Angels trumpet contains scopolamine. Scopolamine is used in medication such as: motion sickness tablets and can also be used before surgery. Despite the possible effects of this plant, people use it for recreational purposes, even though it can cause you to turn in to a metaphorical zombie.
Autumn Crocus (Colchicum Autumnale)
For those of you who live in the United Kingdom, you'd better watch out for this pretty little flower. The Autumn Crocus is native to the UK. This flower contains the toxic chemical Colchicine that can produce effects similar to that of arsenic poisoning. The autumn Crocus is capable of causing liver and kidney failure, but this is in more severe circumstances.
White Snakeroot (Ageratina altissim)
While the White Snakeroot is not the most attractive of plants, there is no denying its deadly capabilities. This plant is native to North America and looks almost like snow due to its white buds. So what makes this plant so dangerous? White Snakeroot contains high levels of a toxin called Tremetol. Although this plant is not known for harming humans directly, all it takes is to drink the milk off a cow who has ingested it.
Yet another purple flower, the beautiful trumpet shaped blooms make the Foxglove look very appealing to people. Getting to close to this flower is not wise as not only is the bloom poisonous, the entirety of it is, from its roots to its seeds. If you were to ingest this flower, expect to experience convulsions, nausea and delirium. Due to the poisons within this flower, in severe cases it can cause all sorts of problems with your heart.