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Without root pruning the plant becomes pot-bound and loses its health and vigour. Root pruning produces a small densely packed rootball that enables the plant to be planted in a suitably scaled container. One important concept a beginner has to understand when undertaking the art of Bonsai, is that the plant retains its small stature through regular pruning, without which it will simply continue to grow until it no longer resembles a bonsai tree for sale but an ordinary garden plant or tree. There are a few plants that will cope with indoor cultivation for short periods of time; often these are tropical species that require winter protection against the cold, but even tropical species need outdoor conditions after the threat of frost has passed in the Spring.