## Why It Works
When eggs boil in water, calcium and other minerals leach slowly from the shells into the surrounding water through the same pores that moisture would normally move through. The resulting water contains dissolved calcium carbonate and trace amounts of other minerals. It's a dilute fertilizer solution — not concentrated enough to show dramatic results quickly, but genuinely useful as a supplemental calcium source, particularly for container plants that deplete soil minerals faster than garden beds.
## How to Do It
1. Boil your eggs as normal in unsalted water. Salt is the critical thing to avoid — even a small amount accumulates in soil with repeated application and causes problems.
2. Let the water cool completely before using. Applying hot water to soil shocks roots and can damage beneficial soil microorganisms.
3. Pour the cooled egg water directly onto the soil at the base of plants. Avoid pouring onto foliage — wet foliage can promote fungal disease.
4. Use within a day or two. Egg water sitting at room temperature develops bacteria quickly.
## Pro Tips
- This is most useful for container plants and houseplants, which have limited soil volume and deplete nutrients faster.
- The benefit is calcium and trace minerals, not nitrogen. Don't expect the same growth response as a nitrogen-based fertilizer.
- Works particularly well for tomatoes, peppers, and houseplants like pothos, which respond noticeably to calcium supplementation.
## When to Use This
Every time you boil eggs, as a default. It costs nothing and takes no extra effort — just move the pot to the counter and let it cool before dumping it outside or on your houseplants.