All dryads have a tree, but do all trees have a dryad?

Answering that question is more difficult than you may think, but the

existence of bonsai dryads has been well documented. These tiny spirits are friendlier than the forest dryads. Some have theorized that the care and reverence shown by people who tend bonsai trees appeals to the bonsai dryads and predisposes them to be more social.