Hairy grenache is the name for a diseased grenache vine that develops swollen leaves covered in spindle-like filaments.
Not exactly. Hairy grenache, or garnacha peluda in Spain and lledoner pelut in the Languedoc Roussillon region of France, is a (good) clone of grenache that has particularly hairy leaves. Like the furry fuzz found on rosemary and other Mediterranean plants, the “fur” evolved as a defense mechanism to protect the vine from heat and conserve moisture. The clone is native to the Spanish region of Catalonia. Wines made from hairy grenache often have a lower alcohol content, but the clone is customarily blended with regular (non-hairy) clones of grenache.