To prepare nettle slurry you need simple ingredients and a little patience. The basic recipe is the following:

- 1 kg of fresh nettles (preferably collected before flowering)
- 10 liters of chlorine-free water (it can be rainwater or let the tap rest for 24 hours)

Preparation:
1. Chop the nettles and place them in a large (non-metallic) container.
2. Add the 10 liters of water.
3. Stir once a day and let it ferment for about 10 to 15 days, until it stops making bubbles (indicates the end of fermentation).
4. Strain the liquid and store the slurry in dark bottles or airtight containers, in a cool place without direct light.

Optional: You can add a stone or floating lid to reduce odors.