The way most people kill bonsai trees is by trying to keep them inside. Bonsai aren't houseplants any more than the original trees are. Unless you make a bonsai from a tropical houseplant species like a ficus or something, they live outside. Steve, some of my favorite collecting grounds around here were mountainside cow pastures. You could find thick-trunked apples, hawthorns, privets, red cedars, elms, hornbeams, pines and such that the cattle had kept grazed and rubbed down.