Buddhas Tree PK 9/18Buddha's Tree PK 9 18 Buddha's Tree PK 9 18 is a completely natural Potassium and Phosphorus additive, which you can use starting with the 2nd week of the flowering stage until the flush. The formula improves your plants' nutrient uptake and increases their natural production of essential oils and sugars. The product breaks down the enzymes in your plants' roots, which strengthens them. The highly soluble formula encourages the growth of stronger