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Biodynamic preparation 501 (horn silica)

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Biodynamic preparation 501 (horn silica)

⚠️ Protective equipment required for this preparation

This recipe involves handling products that may be irritating or toxic. Always wear the following equipment:

Ground quartz matured in a horn over summer

Plant vitality Other

Other

A preparation method specific to this particular record, different from the four usual methods (infusion, decoction, maceration, fermentation).

Process summary

See the record itself for the detailed step-by-step process — there is no single generic process for this category.

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 Biodynamic ✅ Authorised EU Bio-inputs in the European UnionBio-inputs in BurundiBio-inputs in KenyaBio-inputs in RwandaBio-inputs in TanzaniaBio-inputs in UgandaBio-inputs in South SudanBio-inputs in the Congo - KinshasaBio-inputs in Somalia

Biodynamic farming preparation intended for the above-ground parts of plants: in this practice it is sprayed during growth, as a complement to preparation 500.

Application

Application description: On the plants. A pinch of the preparation is stirred for one hour in lukewarm unchlorinated water, changing direction each time a vortex forms. It is sprayed as a very fine mist over the foliage, at sunrise or shortly after, in dry weather, right after stirring. Do not apply just before or after rain, nor on seedlings or recent grafts.

Dose: Indicative: about 4 g in 25 to 50 litres of water per hectare (a pinch for a small vegetable garden).

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Regulatory status

✅ Authorised in the EU Bio-inputs in the European UnionBio-inputs in BurundiBio-inputs in KenyaBio-inputs in RwandaBio-inputs in TanzaniaBio-inputs in UgandaBio-inputs in South SudanBio-inputs in the Congo - KinshasaBio-inputs in Somalia

Bio-inputs in the European Union Bio-preparations authorised in the European Union
Bio-inputs in Burundi Authorised bio-preparations: Burundi
Bio-inputs in Kenya Authorised bio-preparations: Kenya
Bio-inputs in Rwanda Authorised bio-preparations: Rwanda
Bio-inputs in Tanzania Authorised bio-preparations: Tanzania
Bio-inputs in Uganda Authorised bio-preparations: Uganda
Bio-inputs in South Sudan Authorised bio-preparations: South Sudan
Bio-inputs in the Congo - Kinshasa Authorised bio-preparations: Congo - Kinshasa
Bio-inputs in Somalia Authorised bio-preparations: Somalia

Biodynamic preparations are allowed in EU organic production (Regulation (EU) 2018/848, Annex II, Part I, point 1.9.9) and are listed in the East African standard EAS 456 (Annex B). The animal organs used are animal by-products: Regulation (EC) 1069/2009 (Art. 16(f)) allows their use for these preparations with the authorisation of the competent authority (in Spain, generally authorised by Royal Decree 1528/2012, Art. 13).

Official texts

Official sources automatically checked on 27/10/2026.

What the icons mean: ✅ Authorised ⚠️ Tolerated 🟠 Not prohibited ⛔ Not authorised EU 🔎 Status being verified Full details →

Documentary information, checked on 25/10/2026. Not a substitute for legal advice; regulations may vary from country to country. See the regulations · Substances authorised in Europe

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