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Nettle liquid fertilizer

Nettle liquid fertilizer

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Fermented nettle extract

Biofertilizers Bio-input
commercialized
Fermentation Most requested

Fermentation

Biological transformation of the plant material by microorganisms (yeasts, bacteria) in total or partial absence of oxygen, releasing and transforming active compounds over a longer period than the other techniques (days to weeks).

Process summary

1) Chop the plant material and submerge it in water, in a wide, non-airtight container (to let gases escape). 2) Stir daily during fermentation. 3) Let ferment from several days to several weeks, depending on ambient temperature, until it stops foaming. 4) Strain and dilute before use — the undiluted product can be very concentrated.

See all preparation methods

✅ Authorised EU

Traditionally used in organic farming for routine plant care, it provides rapidly available nitrogen when used in diluted form as a foliar or irrigation fertilizer.

Application

Application description: Dilute before applying: approximately 1:10 for foliar spraying as part of your plant's regular care routine, or 1:20 for use as a foliar or irrigation fertilizer. Apply preferably in the morning or at dusk. Repeat every 10–15 days.

Tips

Freshly strained manure can be stored for a few months in a cool place away from light, in a tightly sealed container (it has a strong odor). To use as a foliar fertilizer or for irrigation, dilute it to 10 percent (1 liter of liquid manure per 10 liters of water). For spraying on foliage, use a more diluted solution: approximately 1.5 liters of liquid manure per 100 liters of water. Avoid applying it undiluted, as it can burn the plants.

Preparation process

1) Cut the fresh stinging nettles before they bloom and chop them coarsely. 2) Submerge all the nettles in 10 liters of water in a non-metallic container. 3) Stir well to ensure they are completely submerged. 4) Cover the container without sealing it tightly, allowing the fermentation gases to escape. 5) Stir the mixture every 2 days. 6) Let it ferment for about 10 days, until it stops bubbling and gives off a strong, characteristic odor. 7) Strain the liquid and discard the plant matter (you can compost it).

Ingredients

  • Water ⓘ
  • Nettle (fresh leaves) ⓘ
  • 1 kg of fresh nettle leaves, harvested before flowering. 10 liters of water, preferably rainwater.

Tools and equipment

  • Non-metallic container with a lid (not airtight). Spoon or stick for stirring. Strainer or cheesecloth for straining. Gloves for handling fresh stinging nettles.

Product obtained

A dark brown liquid with a strong odor, rich in nitrogen and minerals, used in diluted form as a foliar or irrigation fertilizer and, when diluted even further, as part of routine foliage care.

Source / Reference

Agromática (agromatica.es) and Pur Plant (purplant.es); SADER and INIFAP (2021). Manuales prácticos para la elaboración de bioinsumos, no. 10: Extractos vegetales (in Spanish). Technical Support Strategy, Mexican Ministry of Agriculture.

Recipe written in our own words by biopreparados.es. Copyright and sources

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Contact person

Grégory Prybys
Tel: +33 7 75 76 37 70 — WhatsApp: +54 9 11 2157 0868
Country: Argentina

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Regulatory status

✅ Authorised in the EU

Bio-preparations authorised in the European Union
Authorised bio-preparations: Argentina
Authorised bio-preparations: Burundi
Authorised bio-preparations: Chile
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

Urtica spp. is a basic substance approved in the EU under Implementing Regulation (EU) 2017/419, which may be used without product authorization in accordance with the conditions set forth in its review report. As a fertilizer prepared for personal use, it does not require European authorization; in France, it is also listed among natural substances used as biostimulants. In Spain, fertilizer applications must be recorded in the farm logbook in accordance with Royal Decree 1051/2022. Its ingredients also appear on the official lists of inputs permitted in organic farming of: Argentina, Burundi, Chile, 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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