The determination of whether a bonsai tree is an "indoor" (tropical or sub tropical trees) or "outdoor" (suited the cool temperate climate of the UK ) variety is important to guarantee its' continued health and is simply a reflection of its hardiness.
Indoor bonsai are trees or shrubs that grow naturally in warm climates and will not usually survive outdoors during our cold winters. Because of their vigorous growth, water and repot more frequently.
Outdoor bonsai are temperate climate trees which are much hardier than "indoor" varieties. Some outdoor bonsai require extra protection in winter dependant upon their natural hardiness when grown in pots.
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