Creating an outdoor plant box with zinc-accumulating plants is a fantastic way to combine gardening with environmental benefits. These plants not only thrive in zinc-rich soils but also help in phytoremediation by absorbing heavy metals. Here are some of the best options for your zinc-accumulating plant box:

1. Alpine Pennycress (Thlaspi caerulescens) – Known for its exceptional ability to hyperaccumulate zinc, this plant is perfect for heavy metal-contaminated soils.

2. Sunflower (Helianthus annuus) – While not a hyperaccumulator, sunflowers can absorb moderate amounts of zinc and add vibrant color to your garden.

3. Willow (Salix spp.) – Certain willow species are effective at zinc uptake, making them great for larger outdoor plant boxes.

4. Indian Mustard (Brassica juncea) – A fast-growing plant that tolerates zinc and other heavy metals, ideal for quick phytoremediation.

5. Clover (Trifolium spp.) – Some clover varieties can accumulate zinc while improving soil health through nitrogen fixation.

Tips for Success:

- Test your soil’s zinc levels before planting.

- Ensure proper drainage to prevent waterlogging.

- Pair zinc-accumulating plants with other tolerant species for a balanced ecosystem.

By choosing these plants, you’ll create a sustainable, eco-friendly outdoor space that’s both functional and visually appealing. Happy gardening!