Whilst some people only admire and study plants in their natural state, others plant them to make a pretty garden at home or to collect them, to 'own' them, sometimes with passion or even compulsion.
The place where one lives, the climate, space and resources for plant care should determine one's gardening or collecting practices. Ferns, succulents, trees and the various other plant categories of the earth each allows and prohibits specific treatment and conditions. Gardening is also an art of the possible. And some gardens need only be in the nature lover's head. Mind gardens are both cheaper and richer!