PK 9-18 increases plant uptake of nutrient and the plants natural oils and sugars thus making heavier yields and more potent crops. It achieves this by breaking down enzymes in the roots of the plant which creates healthier roots, encourages more uptake of phosphorous and potassium.Our local customers who have had the pleasure of using this product have been amazed at the quality of their flowers and buds, their only complaint was a massive increase in their plants natural odours, due to much stronger crops.