No, they aren’t harmful to humans. No carnivorous plant is large enough to pose a threat, and most survive off of insects and bugs. The digestive enzymes they produce are far too weak to harm a human. To quote Sarracenia.com, a great resource on carnivorous plants, “Even if you fell comatose onto a bed of carnivorous plants, the most that might happen is that you would smash some lovely plants and get me mad. I might eat you, but the plants won’t.”
Although it makes for a good story, meat-eating plants are not a threat to humans. All plants are capable of making their own food, however for some it gets a bit more difficult. “Meat-eating” plants like the common Venus fly trap have to lure, their meals when the environment around them does not dish out the minerals necessary to their survival (no pun intended). Small insects are typically the dish of choice, however other species like the Nepenthes are capable of eating small rodents. Humans need not worry.
There is no known carnivorous plant that can harm a human. Firstly, it is an issue of size and strength. A venus fly trap can no more eat a human than a human can judo-throw a humpback whale. Secondly, most carnivorous plants are not able to digest the high protein, fat, and filler in human flesh and other mammals (though there are some known to eat small reptiles and even mammals.)
Since they eat mainly insects, they may be called Insecovorous plants by some. There is a possibility that an undiscovered meat eating plant may be poisonous or something, but the main way these plants work is by luring insects with something sugary and desirable, and poison might work against that, but that’s just my rambling speculation.
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