Biodynamic is a method of farming that treats the entire farm as a single living organism, where soil, plants, animals, and humans are interdependent parts of one system. Dating back to 1924 and rooted in the philosophy of Rudolf Steiner, it goes beyond organic agriculture by incorporating specific herbal and mineral preparations, a planting calendar based on lunar and celestial cycles, and a requirement that farms integrate livestock into their operations. You’ll most often encounter the term on wine bottles, produce labels, or in conversations about sustainable agriculture.
How Biodynamic Differs From Organic
Both organic and biodynamic farming prohibit synthetic chemicals and GMOs. That’s where the overlap ends. Biodynamic farming layers on three additional requirements that organic certification doesn’t touch: the use of nine specific preparations made from herbs, minerals, and animal manure; a planting and harvesting schedule guided by lunar and zodiac cycles; and the integration of animals into the farm ecosystem. A certified organic farm can be a monoculture of one crop with no livestock in sight. A biodynamic farm cannot.
The certifying body for biodynamic agriculture is Demeter International, which requires a valid organic certification as a baseline. Farms must convert entirely to biodynamic methods in one step, including all livestock. With rare exceptions for certain perennial crop operations like vineyards, Demeter will not certify a farm that doesn’t incorporate animals. The logic is that animals provide manure for compost, which feeds the soil, which grows the plants, which feed the animals. The farm is meant to function as a closed loop, generating its own fertility rather than importing it.
The Nine Preparations
The most distinctive feature of biodynamic farming is a set of preparations numbered 500 through 508. These are made from natural materials, often in unusual ways, and applied in small quantities to soil or compost.
Preparation 500, called horn-manure, is cow manure packed into a cow horn and buried in soil for six months over autumn and winter. Once unearthed, the aged material is diluted in water and sprayed on fields to stimulate root growth and humus formation. Preparation 501, horn-silica, follows a similar process but uses powdered quartz buried through spring and summer, then sprayed on leaves to regulate plant growth.
Preparations 502 through 507 are added to compost piles rather than sprayed directly. Each uses a different plant: yarrow blossoms, chamomile blossoms, stinging nettle, oak bark, dandelion flowers, and valerian flowers. The final preparation, 508, is made from horsetail, a silica-rich plant, and sprayed on foliage to help suppress fungal disease. Demeter standards require that all productive areas of a farm receive the spray preparations every year.
To skeptics, these preparations sound like folk remedies. To practitioners, they function as biological catalysts that activate microbial life in soil and compost. The scientific picture is still developing, but the soil outcomes on biodynamic farms are measurable.
What the Soil Data Shows
A 2021 review of international scientific literature found that switching from conventional to organic farming improved more than 70% of soil biological quality indicators, including microbial populations and soil fauna. Switching from organic to biodynamic improved those same indicators by an additional 40%. That’s a meaningful jump, and it suggests biodynamic practices do something beyond what standard organic methods achieve.
A study of French vineyards found that biodynamic plots had higher microbial biomass and bacterial richness than organic plots, which in turn outperformed conventional ones. The complexity of microbial interaction networks, essentially how many species of soil microbes are communicating and cooperating, increased by about 145% in biodynamic vineyards compared to conventional ones. Whether that improvement comes from the preparations themselves, from the overall management philosophy, or from both remains an open question. But the soil under biodynamic farms is demonstrably more alive.
The Planting Calendar
Biodynamic farmers don’t just plant when the weather is right. They consult an astronomical calendar that maps the moon’s position against the twelve zodiac constellations over the course of each month. Each constellation is associated with one of four classical elements (earth, water, air, fire), and each element corresponds to a part of the plant: earth relates to roots, water to leaves, air to flowers, and fire to fruit.
In practice, this means a biodynamic farmer would choose an “earth-root” day for sowing carrots, a “water-leaf” day for planting lettuce, and a “fire-fruit” day for harvesting apples or planting beans. Cut flowers and broccoli (harvested for their flower heads) get an “air-flower” day. The calendar is based on over 40 years of observational research by Maria and Matthias Thun and is published annually. The effects are considered strongest when the soil has been recently disturbed or when the biodynamic preparations have been applied, so timing cultivation and spraying together is part of the system.
This is the part of biodynamics that draws the most raised eyebrows. The gravitational influence of the moon on water (tides, sap flow) is well established, but whether zodiac constellations meaningfully affect carrot growth is not supported by mainstream science. Biodynamic practitioners treat the calendar as a refinement tool rather than a rigid rule.
Biodynamic Wine
Wine is where most consumers first encounter the word “biodynamic.” Some of the world’s most respected vineyards, in Burgundy, Alsace, the Loire Valley, and Oregon, use biodynamic methods. Certified biodynamic wines carry the Demeter seal and must follow strict vineyard and cellar guidelines.
In the vineyard, this means no synthetic herbicides, pesticides, or fertilizers, plus the full suite of biodynamic preparations and calendar-based timing. In the cellar, producers face limits on additives. Sulfite levels in certified biodynamic wines must stay within defined thresholds set by the certifying body, which are generally lower than conventional winemaking allows. Natural composts replace synthetic inputs, and fermentation methods are carefully controlled.
Winemakers who adopt biodynamics often describe the results in terms of terroir expression: the idea that the wine more faithfully reflects the specific soil and climate of its origin. Whether that’s a product of the biodynamic method specifically or of the intense attention to vineyard health that the method demands is debated, but the market for biodynamic wine continues to grow.
Core Philosophy Behind the Practice
Biodynamics rests on a worldview that sustainability isn’t enough. The goal is regeneration: leaving the land in better condition than you found it. Rudolf Steiner, the Austrian philosopher who developed the system, saw agriculture as inseparable from its local ecology, landscape, and culture. Each farm should work with species suited to its region and aim for self-sufficiency in animal feed and soil fertility.
The framework also carries explicit social and ethical commitments. Demeter’s principles include ecological responsibility (covering packaging and transport, not just field practices) and social responsibility, supporting cooperative relationships throughout the supply chain. Biodynamic certification asks more of a farmer than nearly any other agricultural standard, which is part of why it remains a small fraction of global farmland. For the farms that commit to it, the system is less a checklist of techniques and more a way of understanding the relationship between farming and the broader living world.