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Biodynamic gardening involves a number of kinds of compost, including various compost teas. Some are based on wicked weeds like horsetail, which send roots deep into the subsoil. Harvested horsetail tops contain minerals not readily available to plants with shallower root systems, and horsetail teas help combat molds, mildews, blight and fungal attacks.

It is worth repeating here that horsetail should always be cut, not pulled. Pulling up horsetail stems triggers the production of many new stalks. Cutting them, in contrast, depletes the storage root system. Cut horsetail tops can be dried and added to compost piles, but roots should be burned unless they can be thoroughly dried out first.

Biodynamic methods stress improving soil quality, largely through the addition of composts and manures.

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