Why nettles love cannabis plants
Nettles are often considered a weed, but they are a treasure for growers! The liquid manure from nettles (Urtica dioica) contains nitrogen, iron, silicic acid and enzymes that make cannabis plants more resistant to pests and improve the aroma. But how exactly does it work?

Scientific benefits of nettle slurry
Nutrient kick for healthy roots
Nettle liquid manure is rich in:
- Nitrogen (promotes leaf growth)
- Potassium (strengthens the cell structure)
- Silicic acid (increases pest resistance)
Critical question: Is liquid manure better than chemical fertilizer? Studies show that organic nutrients improve soil quality in the long term – synthetic fertilizers can kill microbes.
Natural pesticide substitute
The formic acid it contains is effective against aphids and spider mites. But be careful: excessive concentrations can burn leaves!
Step-by-step instructions
- Collect: 1 kg fresh nettles (without seeds)
- Crush and soak in 10 liters of rainwater.
- Fermentation: Stir for 2-3 weeks in a warm place – the smell is intense!
- Application: Dilute 1:10 with water, water every 2 weeks.
Alternatives & criticism
- Compost tea: Less odorous, but less nutritious.
- Bokashi: fermented nettles for indoor growers.
Warning: manure smells strong – not for balcony growing without a cover!
Sustainability meets yield
Nettle slurry is inexpensive, ecological and increases terpene production. Give it a try – your plants will thank you!