Bioaccumulators are plants that absorb and store toxins, heavy metals, and pollutants from the soil, making them ideal for phytoremediation in outdoor plant boxes. These plants not only help clean contaminated soil but also add greenery to your garden. Here are some of the best bioaccumulator plants for outdoor plant boxes:

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

2. Indian Mustard (Brassica juncea) – Effective in removing cadmium, lead, and selenium, this plant thrives in various soil conditions.

3. Willow (Salix spp.) – A great choice for absorbing heavy metals like zinc and copper, willow trees also provide shade and aesthetic appeal.

4. Water Hyacinth (Eichhornia crassipes) – Perfect for water-based plant boxes, it absorbs mercury, lead, and other pollutants from water.

5. Poplar Trees (Populus spp.) – These trees are excellent for large outdoor boxes, absorbing contaminants like pesticides and solvents.

By incorporating these plants into your outdoor plant boxes, you can contribute to a healthier environment while enjoying a lush, sustainable garden. Choose the right bioaccumulators based on your soil type and pollution levels for optimal results.