Phytoremediation is an eco-friendly method to detoxify contaminated soil using plants. Outdoor plant boxes are perfect for this purpose, as they allow controlled growth of species that absorb heavy metals and pollutants. Here are the best plants for phytoremediation in outdoor plant boxes:

1. Sunflowers (Helianthus annuus) – Known for absorbing heavy metals like lead and arsenic, sunflowers are fast-growing and visually appealing.

2. Indian Mustard (Brassica juncea) – This plant excels at extracting cadmium, chromium, and other toxins from the soil.

3. Willow Trees (Salix spp.) – Ideal for larger plant boxes, willows efficiently remove organic pollutants and heavy metals.

4. Alfalfa (Medicago sativa) – A nitrogen-fixing plant that helps break down petroleum-based contaminants.

5. Poplar Trees (Populus spp.) – Effective for absorbing and storing pollutants like pesticides and solvents.

By incorporating these plants into outdoor plant boxes, gardeners can naturally improve soil health while contributing to a cleaner environment. Regular maintenance and soil testing ensure optimal phytoremediation results.