Hydrangea Pan. Grandiflora 3LHydrangea paniculata Grandiflora is an impressive flowering shrub which produces large cone shaped white flowers. The foiliage is bold Height: Planting : When planting in the open ground it is best planted with a mixture of your garden soil and a good quality Tree and Shrub Compost. If planting in a container then we recommend John Innes No3 Compost or a good quality Multipurpose compost with added John Innes. These plants should be fed in Spring and