what caligrown said -- most nutrient manufacturers make a 2 part or 3 part base and supplements for rooting, foliar feeding, BUDDING, and rinsing.
Look for things with Sugar, Carb, Bloom, Flower, and Fruit in their names.
General Hydroponics has KoolBloom supplement
FoxFarm has Beastie Bloomz
Advanced Nutrients has (and should come as no surprise) about a dozen different ones to choose from