Aquarium gravel is a popular substrate for fish tanks, but can it be repurposed for outdoor plant boxes? The answer is yes—with some considerations.

Benefits of Using Aquarium Gravel in Soil:

1. Improved Drainage: Gravel helps prevent waterlogging by enhancing soil aeration and drainage, which is crucial for plant roots.

2. Pest Deterrent: Its coarse texture can discourage slugs and snails from invading your plant box.

3. Aesthetic Appeal: Colored gravel adds a decorative touch to your garden while serving a functional purpose.

Potential Drawbacks:

- Nutrient Deficiency: Gravel doesn’t retain moisture or nutrients like organic mulch, so additional fertilization may be needed.

- pH Imbalance: Some aquarium gravel contains minerals that could alter soil pH. Rinse it thoroughly before use.

How to Use It:

Mix aquarium gravel with potting soil (1:3 ratio) to balance drainage and nutrient retention. Avoid using it alone, as plants need organic matter to thrive.

In summary, aquarium gravel can be a useful addition to outdoor plant boxes if used correctly. Pair it with quality soil and monitor plant health for best results.