1103P rootstock provides high scion vigor and is tolerant of high alkalinity (high pH soils), high salinity (salt content), and cotton root rot (generally an issue in high pH soils). It is poor at taking up potassium fr...
Black Spanish is an older variety that is tolerant to Pierce’s disease (it can carry the disease and thus be a source of infection if insect vectors are present with no reduction in yield, but Black Spanish vines sold ...