 Like many French grape varieties, plantings of Pineau d'Aunis from the 1960s onward were most often grafted onto SO4 rootstock (an interspecfic crossing of "Vitis berlandieri" and "Vitis riparia").Given Pineau d'Aunis susceptibility to chlorosis, this rootstock did particularly well in vineyards with high calcium content in the soil.However, in most other soils, the rootstock propensity for increased vigor and creating excessive foliage created problems for the vine with canopy management and increase susceptibility to mildew and rot.