Rootgrow - Mycorrhizal Fungi RHS Empathy rootgrow™ contains mycorrhizal fungi which naturally increase nutrient and water uptake by forming a highly efficient secondary root system. It is completely natural and plant-friendly fungi suitable for use on flowering plants, trees, shrubs and edibles. One application will support a plant for its entire lifetime! rootgrow™ doesn’t work on Brassicas, Rhododendrons, Azaleas, Heathers, Cranberries and Blueberries. Please use to rootgrow™ Ericoid for those plants (except Brassicas). Rootgrow contains mycorrhizal fungi which naturally increase nutrientand water uptake by forming a highly efficient secondary root system. 60gr pouch: A single use sachet which will treat up to 1 x 10L pot; 150gr pouch: 6 month's supply for the average gardener. One pouch will treat up to a 50L container or 8 x 2L pots;360gr pouch: A year's supply for the average gardener. One pouch will treat up to a 100L container or 19 x 2L pots;