The Root System
The Root system must be well developed by good nursery practice influenced by the natural characteristics of the species/cultivar taking into account its age and growth rates under the cultural and soil conditions within which it is growing. The system must not show any coiled main roots close to the collar, nor any physiological damage. The root system must not be allowed to dry out at any time.
Bamboos can be supplied rootballed (balled and wrapped) or container grown.
If they are not container grown, typically bamboos are supplied with a rootball.
Rootballs must be firm and solid and the roots must penetrate the whole ball. They must be enclosed in hessian (burlap). The size of the rootball must be appropriate for the species/cultivar and its age and growth rates under the cultural and soil conditions within which it is growing. The rootball must be free of perennial weeds.
The rootball of specimen bamboos will be additionally protected with ungalvanised wire netting, wire basket, spring ring, root control bag, tree cradle or custom built container. All materials used to support rootballs must decompose within eighteen months of planting and not constrict the continuing growth of the plant.
Container grown bamboos
Container grown plants should have been grown in the container for sufficient time for the root growth to have substantially penetrated the medium without being root-bound. The rooting must be well balanced in accordance with the container size.
Plants are to be centered in the container, well rooted, firm and moist on delivery, with the growing medium coming within a suitable depth of the pot rim, taking into account the size of the container and the age since potting. Bamboo is not an easy species to pot due to its habit of root growth.
The surface of the growing medium shall be free of all weeds. Plants shall be supplied in rigid containers. Container grown plants are defined by ‘C’ followed by a number indicating the volume in litres, e.g. C5.
Pot grown plants are defined by P followed by a number indicating the upper, outside width in cm, e.g. P9.