Winegrowers Supplies - Rootstocks for Grafted Vines
Good tolerance of limestone (CaCO3); will tolerate up to 25% 'active' limestone (i.e. the limestone part of the soil which the vine can take up; this is very dependent on the composition and structure of the soil). Excess active limestone generally has a detrimental effect on growth and causes chlorosis (a physiological ailment, due to various causes, resulting in yellowing of leaves and other green parts of the plant).
Strength of growth is low to medium, less vigorous than SO4, so it is best used for naturally strong growing varieties.
Has a 'semi-plunging' root system'. Sensitive to very wet soil, average to poor resistance to very dry soil.
It advances the vegetative cycle and encourages especially early maturity, also it decreases the risk of 'rot pedonculaire' (a type of stalk rot).