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Beach seaweed tea

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Beach seaweed tea

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Biofertilizers Maceration Plant-based

Maceration

Cold extraction by prolonged soaking of the plant material in a liquid (water, oil or alcohol depending on use), without heat. The longer contact time than an infusion extracts compounds that cold water alone would dissolve too slowly.

Process summary

1) Chop or crush the plant material. 2) Fully submerge it in the chosen liquid, in a closed container. 3) Let it sit in a cool, dark place, stirring occasionally, for anywhere from several hours to several days depending on the preparation. 4) Strain and use the resulting liquid.

See all preparation methods

 ✅ Authorised EU Bio-inputs in the European UnionBio-inputs in AustraliaBio-inputs in Brazil

Australian liquid fertiliser: seaweed washed up on the beach steeps in water inside an old pillowcase, like a giant teabag, until it gives a brown liquid rich in potassium and trace elements.

Application

Application description: Watering at the base of vegetables, fruit trees and pots.

Dose: 1 part tea to 10 parts water.

Tips

Check with the local council first: in Australia most councils regulate where and how much seaweed may be collected. Keep a dedicated bucket with a lid, as the liquid smells strong. The same method works with weeds (2 weeks, 1:10) or aged manure (2 weeks, 1:15).

Preparation process

1. Gather freshly washed-up seaweed from the beach, where collection is allowed. A quick fresh-water rinse is optional: the salt it carries is negligible.
2. Fill an old pillowcase with it and knot it.
3. Put it in a 20 L food-grade bucket and fill with water.
4. Leave to steep for about a month, lid on.
5. Lift out the pillowcase: the liquid is ready. Put the leftover seaweed in the compost.

Ingredients

  • Water ⓘ — 5.283 gal
  • Seaweed ⓘ
  • Beach-cast seaweed (enough to fill a pillowcase); about 20 L of water.

Tools and equipment

  • 20-litre bucket
  • Fine cloth for filtering

Preparation time

About 1 month.

Product obtained

Brown liquid with a strong sea smell.

Source / Reference

West, P. «Cuppas for crops: how to make your own fertiliser 'teas'». The Guardian (Australia): https://inkl.com/news/cuppas-for-crops-how-to-make-your-own-fertiliser-teas — Recipe written in our own words.

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

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Contact person

Grégory Prybys
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Country: Argentina

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Regulatory status

✅ Authorised in the EU Bio-inputs in the European UnionBio-inputs in AustraliaBio-inputs in Brazil

Bio-inputs in the European Union Bio-preparations authorised in the European Union
Bio-inputs in Australia Authorised bio-preparations: Australia
Bio-inputs in Brazil Bio-preparations authorised in Brazil

Authorised in Australia, the EU and Brazil. Australia: the National Standard for Organic and Bio-Dynamic Produce accepts seaweed and seaweed products as fertilisers; beach collection depends on each council. EU: seaweed and seaweed products are listed in Annex I of Regulation 2021/1165. Brazil: Law 15.070 of 2024 allows bio-inputs to be produced on the farm for own use, without registration and without sale. Use as a fertiliser, without claiming any effect against pests or diseases.

Official texts

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

Documentary information, checked on 01/11/2026. Not a substitute for legal advice; regulations may vary from country to country. See the regulations · Substances authorised in Europe

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