Interview with GuildSomm technical writer Jennifer Angelosante on a range of viticulture topics. For members, our new expert guide on viticulture can be found here.
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It's Vitis berlandieri. Most of the rootstocks used on limestone are hybrids of berlandieri and another species. An example is 41B (Vitis berlandieri x Vitis vinifera). Vitis vinifera is also tolerant of limestone, but it is susceptible to phylloxera.
What is the name of the rootstock she mentioned - normally used on Limestone soils?