420 A de MILLARDET Y GRASSET
Berlandieri Grasset x Riparia.
Rootstock planted in La Rioja many years ago.
It has a low vigour, and it needs a quality, cool soil.
Resistant to limestone and sensitive to nematodes and drought.
Earlier ripening than other rootstocks.
Suitable in high-density plantations (3,500 to 4,000 plants/ha), where it produces high quality grapes.