Everyone needs a WalledGarden

Once upon a time, there was a wizard who kept his garden in the middle of a walled castle. That way it would not be disturbed by people who might not know what to do with a magic garden. Sometimes he would let others in and show them around, give them clippings so they too could start their own magic gardens. Other times of course, he would sit on his wall and turn people he didn't like into toads.