Frog’s Leap, winery in the Rutherford AVA of Napa Valley in California.

Owner: John Williams.

Organic certification: Yes.

Organics: Williams bought a phylloxera-infested plot of vines from his neighbour by cutting off the irrigation and sowing cover crops, to force the roots deeper and away from the louse.

White wines

Sauvignon Blanc

Red wines

Frog’s Leap Cabernet Sauvignon

Frog’s Leap Zinfandel, Napa Valley: 1990 Lighter vintage (rain). | 1991 Organically farmed grapes, wild yeast, natural MLF. | 1996 73% Garden Vineyard, 21% Williams Ranch, 6% Tamagni Vineyard, contains small amount of Petite Syrah, 15 months on French and American oak, 13.5% alcohol.