nut/cuttings regrowth speed

nut/cuttings regrowth speed is it bugged or intentional that it takes 1 month to regenerate any kinds of nuts or tree cutting ? I have tested this of number of trees and bushes.
This include all trees and also acrons. Changing acron from 1 day to 1 month thats big extreme. My acrons have still not regrown since the patch its faster to replant them and grow entire new bush.
This include all trees and also acrons. Changing acron from 1 day to 1 month thats big extreme. My acrons have still not regrown since the patch its faster to replant them and grow entire new bush.