This method is very simple and requires no complex preparation.

Recipe:

• A handful of old nails, screws, or iron filings.

• Water (if you wish to accelerate oxidation).

• A jar or container.

Steps:

1. If the nails are only slightly rusted, leave them in a jar of water for several days to encourage oxidation.

2. When they acquire a deep reddish color, they are ready to use.

3. Iron filings can also be used directly without prior oxidation.

4. Drain excess water before placing them in the soil.