Spiders are good Tho some people might not wish to have them inside. I leave the really tiny ones on plants, bigger ones get caught and relocated outside
Spiders are good, wonderful predators of all the tiny herbivores that will munch on your plants. There are only a very few spiders that are dangerous to humans and pets, and those don't usually hang out on plants. Black widow and brown recluse are the only ones I get rid of. In the Southwest, it's very bad luck to kill a spider, I'm not sure if that's true in your area, but be careful!