How deep do grapevine roots grow down into the soil?

esearch has shown that grapevine root development is controlled by two factors: the genotype of the vine, i.e. the rootstock or, in the case of ungrafted vines, the scion, and the soil environment. Most roots are found within the top one meter (3 ft), however, a few roots can be found at deeper depths, and rarely roots at extraordinary depths (more than 10 meters, or 30 ft).