KULT PLANT GROWTH REGULATOR 1LTRActive Ingredient: Paclobutrazol To reduce vegetative growth in mango, stone fruit and apple trees as per the Directions of Use. Surefire Kult Plant Growth Regulator reduces vegetative growth in mango, stone fruit, and apple trees, suppresses winter grass (poa annua) in certain turf varieties and controls growth in various hedging plants. BOOKLET Surefire Kult. pdf. aspx