Florel Plant Growth Regulator is registered to reduce or eliminate undesirable fruit development on many ornamental trees and shrubs such as: apple, buckeye, carob, cottonwood, crabapple, elm, flowering pear, horse chestnut, maple, oak, olive, pine, sour orange, sweet gum (liquidambar) and sycamore. It also works on many other species that produce nuisance fruit.