Florel is a contact growth regulator based on the chemical ethephon. It is widely used in agriculture as a ripening agent. Florel is registered to control nuisance fruit in ornamental trees & shrubs such as: apple, buckeye crab-apple, carob, cottonwood, elm, flowering pear, horsechestnut, liquidamber (sweet gum) maple, oak, olive, pine, sour orange & sycamore trees.