The Maury co-opérative has traditionally kept stocks of very old wine, ageing in the roof space of their rabbit warren of buildings, often in 100 year old demi-muids. The majority of these contain mother wines dating from the late 1920s. Individual casks are bottled and numbered, taking care only to draw off about 1/3 of the wine, and are then topped up. These traditional, long-aged, vins doux naturels were produced from variously-coloured Grenache grapes, grown on the arid schists around Maury, which gives them great firmness and the long ageing in old casks results in appetising rancio flavours.