
It could be a sunlight problem?
You could test it by digging up the bush and bamboo shoot (to its right) and replant the bush.
If the bush grows, then its a sunlight problem.
Also wasn't there a tree/bush limit per 7x7 area?
Something like 8 trees and 15 bushes. Not sure how it applies to your situation though, since that one is your 15th bush...