TwiggyTobI cultivate carnivorous plants
how useful are those against mosquitoes?
Musquitoes don't care. they hunt live prey whereas the plants use a nectar-like substance to lure foraging insects.
they will get stuck in sundews, but it'd be a coincidence. A flyswatter is most effective. And then you can throw the dead musquito into the sundew
The pitcher plants absolutely destroy flies and wasps. About 3 or 4 years ago I had around 70-80 pitchers at once and all were full of flies and wasps by the end of summer. Pitchers can catch pollinators like bees, though the bees don't often visit the traps because their instincts makes them prefer flowers. It also catches random beetles, mimic flies, etc. Anything that likes the nectar
Venus fly traps catch way less than you want them to but they're neat. Daddy long-legs get caught the most by far. Sometimes I'll throw in a live house fly myself if I catch one. they need to detect movement before closing, and the prey still needs to be alive after that for the plants digestive enzymes to be released
Sundews and Butterwort catch tiny bugs. gnats and such. You won't stop a gnat infestation in your houseplants' soil w sundews alone
tl;dr Pitcher plants will catch a bunch of flies and wasps, everything else is mostly there to look cool