The 3309 Courderc is a grapevine created from a cross between Vitis riparia Tomenteux and Vitis rupestris Martin made by the breeder Georges Couderc in 1881. The 3309 Couderc has good resistance to phylloxera and is used as a rootstock. It has moderate vigor, develops a shallow but powerful root, and accelerates the vegetative cycle (of the grafted Vitis vinifera variety). Furthermore, the 3309 Couderc is sensitive to flooding, has little resistance to nematodes, a low lime tolerance (maximum 11% active lime) and is sensitive to chlorosis (IPC = 10). It thrives best on deep, nutrient-rich soils with little lime and a regular supply of water.