Plants have a natural rhythm to their flowering regime.When in growth there are no flowers, and when the conditions are met for flowering, flowers will start to show slowly at first then around the third week will start to explode on to the plant. It is at this time that we introduce power to bloom to the roots. Power to bloom's chemistry make up will assist flower development, causing bigger blooms. This unfortunately decreases the available mineral elements from the growing medium. So Growing Edge Technologies recommends you mist your plants with Umph Power 4 days after you have introduced Power to Bloom to your plants.