Any kind of plant that can be grown for ornamental purposes inside a house. The house plants of temperate regions mostly originate from warmer parts of the world, many being known as outdoor garden plants in subtropical climates (for example, abutilons, poinsettias). The most widely grown house plants are those that will tolerate the most adverse conditions, in particular very low light levels, low humidity, dust, and air polluted by gas combustion. Aspidistras and sansevierias are renowned for their hardiness in these respects.