Outdoor bonsai trees and the easiest indoor bonsai trees tend to all be heavy feeders alike, so it's vital to fertilize them regularly through the active growth season. 'If you don’t fertilize a ...

Apple bonsai trees require regular fertilization during the growing season. Use a balanced fertilizer such as 10-10-10 or 12-12-12, and apply it once a month. Reduce fertilization to once every ...