Bonsai will work. You have to pick your trees well for the heavy snake and have a big enough enclosure with strong enough lighting. Older trees will work as they will have thicker branches. You can cheat and go to the local nursery and get the same tree pre bonsaid in a 10 gal landscaping pot and that way it will be older and sturdier as well. If you provide the size of the enclosure i can help with some trees or bushes that will work for this purpose. In my hognose viv i have coastal rosemary, honeysuckle, ivy, azalea, grewia, and chinese elm. The ball python only has ficus for now, but he is getting a much bigger enclosure as soon as i move and he is getting bigger trees then too.