Most trees and shrubs grown as bonsai prefer a bright spot indoors. Tropical species make for the best bonsai houseplants. Water most varieties of bonsai once the potting mix starts to dry. It's important not to overwater bonsai; too much water can make the roots drown and die. Fertilize once or twice during the spring and summer months with a general-purpose fertilize made for use on indoor plants. Bonsai does require yearly pruning to keep it in shape and from outgrowing its container. When shaping your bonsai, don't forget to remove the plant from its pot and prune the roots as well as the shoots, to keep it from becoming rootbound. Note: Bonsai is not intended for human or animal consumption.