Peter Beales Roots Boost contains essential ingredients for robust rose growth, increased nutrient and water uptake, healthier plant performance and suppression of soil borne diseases. One 60g pack treats up to 4 roses. Roots Boost should be sprinkled in the planting hole so that it comes into direct contact with the roots when planting any rose. The friendly fungi will attach to the roots of the plant making it easier for them to uptake the essential nutrients and water needed for initial healthy growth.