Give Your Plants A Head Start On Giving You Better Flowers Your plants need Phosphorus and Potassium (P&K) from the earliest days of bloom phase so they can maintain nutrient healthy roots vigorous growth sturdy stems and stalks and maximized production of flowers. Feed Bud Blood Powder to your plants as soon as you switch to 12 hour lighting so your plants get the P and K they need for a successful bloom phase. Bud Blood Powder is specially designed for use with all hydroponic growing media including coco coir as well as continuous liquid-feed growing systems such as aeroponics drip irrigation and emitters NFT flood and drain and deep water culture.