The Magic of Weeds in Water
TL;DR
Weeds are nutrient-dense plants that can be composted, used as mulch, or soaked in water to create a free liquid fertiliser. Liquid weed feed delivers nutrients rapidly to plant roots and avoids spreading weed seeds — making it especially useful when clearing seeding weeds from the garden. ---
Key Concepts
Chop and Drop
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Chopping plant material and leaving it on the soil surface around growing plants to return nutrients directly
Chop, Move, and Drop
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Transporting weed material from outside the garden (e.g. a nettle patch) into beds as mulch
Liquid Weed Feed
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Soaking weeds in water for weeks to months to extract nutrients into solution for rapid root uptake
Single-type feed
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Made from one weed species to target a specific nutrient (e.g. dock for potassium)
Multi-purpose feed
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Mixed weeds combined for a balanced, broad-spectrum liquid fertiliser
JADAM technique
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Adding a handful of leaf mould from under a deciduous tree to introduce soil biology and accelerate breakdown
Weed (definition)
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A plant growing where it shouldn't — context-dependent, not species-dependent
Notes
§Why Use Weeds as Fertiliser
- Weeds accumulate nutrients: nettles contain potassium, magnesium, calcium; dock is high in potassium; creeping thistle contains iron
- Liquid form delivers nutrients faster than compost — solution moves directly to roots
- Free resource, often available in abundance
- Soaking weeds with seeds in water renders seeds harmless — avoids spreading them via compost
§Chop and Drop / Chop, Move, and Drop
- Standard chop and drop: chop leaves/stems and leave them on the soil surface in place
- Chop, move, and drop: harvest weeds from outside the garden, chop, and mulch onto beds
- Benefits: adds nutrients, protective soil covering, improves moisture retention in dry weather, improves drainage in wet weather, builds organic matter as it breaks down
§Making Liquid Weed Feed
- Leak-proof bucket or container
- Collected weeds (single type or mixed)
- Water
- Loose-fitting lid or planks/slab to cover
- Optional: handful of leaf mould from under a deciduous tree
§Applying Liquid Weed Feed
- 2 weeks to ~4 months old: dilute 1 part feed to 10 parts water
- 5–6+ months old (more potent): dilute 1 part feed to 50 parts water
- Strain through a sieve before pouring into a watering can to prevent blocked roses
- Start cautiously, observe plant response, adjust as needed
- Apply as a standard watering to get liquid down to the roots
§Maintaining a Continuous Supply
- As liquid is drawn off, top up the bucket with fresh weeds and water
- Solids break down over time; no need to remove them
- Keep the same bucket running throughout the growing season
- In cold climates, bring buckets undercover in winter to maintain microbial activity; the breakdown period over winter can be used productively, with feed ready for spring
Actionable Takeaways
- Collect seeding weeds and submerge them in a bucket of water rather than adding them to compost — extracts nutrients without spreading seeds
- Add a handful of leaf mould from under a deciduous tree to introduce biology and speed up the process
- Use dock or nettles alone for a targeted feed (potassium / nitrogen-calcium), or mix multiple weed species for a balanced general-purpose fertiliser
- Dilute at 1:10 for young feed (2 weeks–4 months); 1:50 for older, more concentrated feed
- Top up the bucket continuously with fresh weeds and water so you always have feed in production
- Move buckets undercover before a hard freeze to keep the biological process active through winter
Quotes Worth Keeping
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There's strength and power in diversity — the same thing applies to creating a nutrient-rich liquid feed for your plants.
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The definition of a weed is a plant growing in a place where it shouldn't be grown.