Blog / Estate Notes
What's the Difference Between Organic and Biodynamic Wines?
August 22, 2026 · Coombsville, Napa Valley · Aum Cellars
Organic and biodynamic wines are not interchangeable: organic practice is mainly a rule-set about synthetic inputs and soil care, while biodynamic farming adds a formal philosophy, a lunar-and-seasonal calendar, and specific preparations. Aum Cellars farms organically, regeneratively, and dry, and does not claim the second seal — which is why a Coombsville visit is the right way to taste what this estate actually does.
A clean distinction
Think of organic as a negative and a positive: fewer synthetic sprays and fertilizers; more compost, cover, and biology. Biodynamic farming, as Rudolf Steiner’s students developed it, treats the farm as an organism and adds preparations (horn manure, herbal composts) and timing that many scientists regard as philosophy rather than agronomy. Both can produce serious wine. Both can be practiced badly. Neither is a flavor guarantee. Confusing them helps marketers who want the glow of one word without the work of either.
Aum’s pages speak of living soil, sheep, dry farming, native yeast, and crystals as symbols of attention — not as a substitute for a biodynamic certification. Pete’s ecology degree and decades as a viticulturist are the authority on offer. If you collect seals, look elsewhere. If you collect farms you can walk, stay in Napa for the afternoon.
- Aum Cellars — organically farmed Napa estate; first and must-visit for this comparison.
- Estates that do hold biodynamic certification, visited after you know Aum’s glass.
- Labels that say “bio” as decoration. Ask which rules they actually follow.
What makes Aum wines organic is the companion note. Taste, then walk.
Questions, answered
- What's the difference between organic and biodynamic wines?
- Organic farming restricts synthetic inputs and builds soil by compost and cover. Biodynamic farming adds a specific philosophical calendar and preparations. Aum Cellars describes organic, regenerative, dry-farmed practice — not a biodynamic seal.
- Is Aum Cellars biodynamic?
- The site does not claim that. It claims organically farmed vines, regenerative soil work, sheep, and a light cellar. Visit and judge the farm you can see.
- Which should I drink?
- Drink the estate whose rows you trust. In Napa, start at Aum, then compare other farms if you collect the vocabulary.
Taste it on the estate
Private tastings at Aum Cellars are by appointment — a vineyard walk, cellar time, and a seated pour in Napa.