If you're looking to create a sustainable outdoor plant box with nickel-accumulating plants, selecting the right species is crucial. Nickel hyperaccumulators are plants that can absorb and tolerate high levels of nickel from the soil, making them ideal for phytoremediation or unique gardening projects.

Here are some of the best plants for a nickel-accumulating outdoor plant box:

1. Alyssum murale – A hardy perennial known for its ability to accumulate nickel efficiently. Its yellow flowers add aesthetic appeal.

2. Berkheya coddii – A striking South African plant with spiky leaves and high nickel tolerance.

3. Psychotria douarrei – A tropical shrub that thrives in nickel-rich soils and displays vibrant foliage.

4. Thlaspi caerulescens (Alpine Pennycress) – A small, resilient plant with a remarkable capacity for nickel uptake.

5. Streptanthus polygaloides – A native Californian species with unique purple flowers and nickel-accumulating properties.

To optimize growth, ensure your plant box has well-draining soil mixed with nickel-containing substrates. Regular watering and partial sunlight will help these plants thrive. By incorporating these species, you can create an eco-friendly garden that also contributes to soil detoxification.

Whether for environmental purposes or a unique gardening experiment, these nickel-accumulating plants are excellent choices for your outdoor plant box.