It's no wonder why this is one of our best selling fertilizers. NutriStar for Bougainvilleas is a fast acting, sustained release formula with four nitrogen sources as well as Epsom salt and a very low salt source of potassium. Repeat applications every 14 days until Bougainvilleas begin to bloom, then fertilize only once per month. For best results, allow the plant to dry thoroughly, then fertilize and water profusely.This fertilizer blend includes monoammonium phosphate, ureaform, ammonium sulfate, potassium sulfate, activated sludge, magnesium oxide, magnesium sulfate, calcium sulfate, sulfur, iron sulfate, zinc sulfate, manganese sulfate, copper sulfate, iron oxysulfate.Not just for Bougainvilleas! This can be used on any flowering vines to maximize the size, color, and quantity of your blooms!Great fertilizer for: Bougainvillea, Mandevilla, Diplandenia, Passion Vine, Honeysuckles, Jessamines, Wisteria, Coral Vine Queen Ann's Lace, Trumpet Vines, Allamanda. The reason that our fertilizers work so well in helping you to grow healthy plants is the ingredients. Nelson Plant Food builds products that are horticulturally correct for each type of plant. Extensive research is done to make sure that plants are fed correctly with each NutriStar or ColorStar product.