If the plant doesnโt need it, adding a supplement can sometimes do nothing, or even worse it could hurt your plant. For example, if you add a PK booster when youโre already giving full strength base flowering nutrients, you could burn or even kill your plants! Pk Boosters and Shooting Powderd โ With this type of supplement, the main ingredients are just Phosphorus and Potassium because they are important for flowering. These also sometimes contain some amount of sulfur. In general, use these sparingly as theyโre usually very potent! And donโt forget that every quality base Bloom nutrient should already contain plenty of P and K. Giving relatively low levels of Nitrogen during the flowering stage helps buds fatten up.