What is the point of them stunting? The only people who do this (in theory) would be larpers, except even they're not doing this because the stunt chance is so damn high you might as well use a damn table and get a fully grown tree 100% of the time.
If stunting MUST exist for people solely trying to beautify shit, at least make trees become unstunted every spring. Eventually they'll reach full size then at least.
Also the planting timer is too long, shorten it by about 43%.