Sucker Punch Ready To Use is a plant growth regulator specially designed for use on ornamental trees and other woody plants. To work effectively, you need to prune the tree or plant properly. Afterwards, let the sprouts regrow, then apply Sucker Punch Ready To Use when the sprouts are 10 inches long or less. Sucker Punch is a water based paraffin wax emulsion PGR (plant growth regulator) sprout inhibitor. It stops sprouting suckers from pruning cuts and roots of ornamental trees and other types of woody plants. One treatment lasts for 6 months.