Heavy metal pollution in soil is a growing concern, but certain plants can naturally absorb and detoxify these harmful elements. Outdoor plant boxes are an excellent way to cultivate these species, especially in urban or industrial areas. Here are the top plants for heavy metal absorption:

1. Sunflowers (Helianthus annuus) – Known for extracting lead, arsenic, and uranium, sunflowers are fast-growing and easy to maintain.

2. Indian Mustard (Brassica juncea) – Highly effective in absorbing cadmium, lead, and selenium, making it ideal for contaminated soils.

3. Willow Trees (Salix spp.) – Their deep roots absorb zinc, copper, and nickel, suitable for larger plant boxes.

4. Pteris Ferns (Pteris vittata) – The best plant for arsenic removal, thriving in partial shade.

5. Poplar Trees (Populus spp.) – Efficient in absorbing heavy metals like mercury and chromium, perfect for spacious outdoor setups.

For optimal results, combine these plants with organic compost and ensure proper drainage in your plant boxes. Regular soil testing helps monitor detoxification progress. By integrating these species, you can transform polluted areas into healthier, greener spaces naturally.