A Bonsai tree I inherited from my Dad many years ago. Initially battled to keep it going, but lately it seems to be flourishing and growing quite strongly. It really teaches one patience and attention to detail, and can be quite therapeutic.
It has become a real obsession to make sure it survives, as it was one of the last things he gave me before he passed on.
Bonsai is a Japanese art form using cultivation techniques to produce small trees in containers that mimic the shape and scale of full size trees.