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Horsetail (Equisetum arvense) Decoction

Horsetail (Equisetum arvense) Decoction

Plant vitality Decoction Plant-based

Decoction

Extraction by prolonged boiling, used for hard plant parts (roots, bark, woody stems, seeds) whose active compounds need more time and heat to release than a simple infusion provides.

Process summary

1) Finely chop the hard plant material. 2) Cover with cold water in a pot. 3) Bring to a boil and simmer for 15 to 30 minutes (sometimes longer, depending on the material). 4) Let cool, strain and use the resulting liquid.

See all preparation methods

✅ Authorised EU

A light brown-green liquid with a plant-like odor; leaves no residue after filtration. It does not keep well: use within 24 hours. Results are not guaranteed: they depend on the preparation, the time of use, and local conditions.

Application

When to use: Routinely and occasionally

Opportunist: Powdery mildew (Fungus) Downy mildew (Fungus) Scab (Fungus) Peach leaf curl (Fungus) Alternaria (early blight) (Fungus)

Warning: the associations between recipes and opportunists come from other references (traditional practices, publications, user feedback). They are neither a recommendation nor a claim of effectiveness. There is no certainty regarding the preparation, application and use of these bio-preparations. See the regulations

Application description: Use approved by Implementing Regulation (EU) No. 462/2014 and its review report (SANCO/12386/2013), including extensions: fungicide. Apple: leaf spot and powdery mildew (BBCH 53–67, spring). Peach: peach leaf curl (Taphrina deformans). Grapevine: downy mildew and powdery mildew (BBCH 10–57). Cucumber: powdery mildew and Pythium (foliar and soil application). Tomato: Alternaria leaf spot and septoria leaf spot (BBCH 51–59). Strawberry, raspberry, and potato: downy mildew, gray mold, leaf spots. Apply during rainy weather, not in hot conditions.

Dose: 200 g of dried plant material per hL (2%) for apple trees, peach trees, grapevines, cucumbers, and tomatoes; 225 g per hL for strawberry plants, raspberry plants, and potatoes. Approximate volume: 500–1,000 L/ha for fruit trees (1–2 kg of plant material/ha), 100–300 L/ha for grapevines (200–600 g/ha). Apple, peach, and grapevines: 2–6 applications, every 7 days. Strawberries, raspberries, and potatoes: 4–8 applications, every 5–14 days. Cucumbers: 2 applications (pre-harvest interval: 15 days). Tomato: 2 applications, every 14 days (pre-harvest interval: 15 days).

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Regulatory status

✅ Authorised in the EU

Bio-preparations authorised in the European Union
Authorised bio-preparations: Burundi
Authorised bio-preparations: Colombia
Authorised bio-preparations: Costa Rica
Authorised bio-preparations: Indonesia
Authorised bio-preparations: India
Authorised bio-preparations: Kenya
Authorised bio-preparations: South Korea
Authorised bio-preparations: Morocco
Authorised bio-preparations: Peru
Authorised bio-preparations: Philippines
Authorised bio-preparations: Rwanda
Authorised bio-preparations: Tanzania
Authorised bio-preparations: Uganda

Basic substance approved in the EU (Regulation (EU) No. 462/2014 (review report SANCO/12386/2013 and extensions from 2016 and 2017)). May be used without a product authorization, solely for the uses, doses, and preparation methods described in its review report. Approved for use in organic production. Its ingredients also appear on the official lists of inputs permitted in organic farming of: Burundi, Colombia, Costa Rica, Indonesia, India, Kenya, South Korea, Morocco, Peru, Philippines, Rwanda, Tanzania, Uganda. Depending on the country, some are only allowed under conditions (certification body approval, maximum doses): see each country's page.

Official texts

Official sources automatically checked on 20/10/2026.

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

Documentary information, checked on 19/10/2026. Not a substitute for legal advice; regulations may vary from country to country. See the regulations · Substances authorised in Europe

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