There is no particular shape that you need to make your bonsai. Bonsai trees are a reflection of you and the style of bonsai you choose to shape your tree with reflects your own unique personality. Pruning and wiring a bonsai is a labor of love. While you are creating something that is uniquely your own it is important to remember that these trees are delicate and care must be taken in order not to damage a branch or trunk. Once wiring is done – you leave the wire in place for as many as six months to allow the tree to be trained into the shape you desire.
A special note about gardenia bonsai. You should only prune and wire a bonsai gardenia when it is not actively blooming or budding. In fact pruning should only take place immediately after a blooming session as finished. To keep you bonsai small make sure that you not only prune, but that you pinch off new buds.