Rootgrow Professional - Mycorrhizal Fungi RHS Empathy rootgrow™ Professional (RGpro) contains pure mycorrhizal fungi packaged and supplied in large pack sizes for professional users or when larger planting projects are undertaken. All RGpro tubs contain sachets of gel powder to be used on bare-root plants if required and a handy 25ml measuring scoop Suitable for garden designers, landscapers and private individuals with large gardens or planting projects. Rootgrow contains mycorrhizal fungi which naturally increase nutrientand water uptake by forming a highly efficient secondary root system. 2.5Kg bucket: 500 x 2 Litre pots or 550-1650 bare root whips.