Just like being literate a good example is primary. Some times children forced to do anything just shuts down the process . Of course not everyone has access to a potential garden. Community gardens can and do fill the gap. But nothing beats going out back and playing in the dirt all year long. Coupled with a garden catalogue perhaps some garden art. Visits to all sort s of gardens simple and formal may inspire. If ones parents are not involved perhaps a crazy aunt or uncle can substitute. I'm reminded of the star trek captain at academy whose mentor was a gardener. The love and interest in nature can be learned but not forced. To bring out the wonder is a hope and I feel a good description of maturity.
Bill Inspire = to keep spirt in