Winegrowers Supplies - Rootstocks for Grafted Vines
5BB (Selection Kober)
Adapts to the widest range of soil types. Very
fruitful in soils which are not rich in nutrients. Good for poor stony or
shallow soils. Good tolerance of limestone; can stand up to 40% total, 20%
active. Resistant to chlorosis.
Very vigorous growth, it delays the vegetative cycle and is unsuitable for varieties which are prone to coulure / sensitive in flowering (except possibly in light and dry soils). It easily goes to coulure when planted in soils that produce a lot of shoots and growth; at flowering it gives assimilates to the shoots and leaves and not enough to the embryo clusters. In very wet years there have been cases of no fruit-set due to over vigour of shoots and leaves. 5BB is often chosen for varieties which have naturally low vigour.