B-Nine WSG is a plant growth regulator that will slow the growth of plants. If you apply it during the flowering stage, it will delay that process.
B-Nine WSG Plant Growth Regulator does not speed up the growth of the plant. Treated plants will develop a shorter, more compact growth.
B-Nine WSG Plant Growth Regulator would not be a great choice as it is not labeled for any of of those trees. Atrimmec Plant Growth Regulator (PGR), this is labeled for Crepe Myrtles and Holly trees however not labeled for Oak and Maple trees. For Oaks and Maples, it is better to use something like Sucker Punch Ready to Use for a plant growth regulator specially designed for use on ornamental trees and other woody plants.