Selenotropism, the ability of certain plants to thrive in selenium-rich soils, is a fascinating adaptation that can be showcased in outdoor plant boxes. For gardeners interested in this unique phenomenon, selecting the right species is key.

1. Astragalus bisulcatus (Two-Grooved Milkvetch): A well-known selenium accumulator, this perennial legume exhibits striking selenotropism, making it ideal for educational displays.

2. Stanleya pinnata (Prince’s Plume): With vibrant yellow flowers, this plant not only tolerates high selenium but also demonstrates visible adaptations like leaf discoloration.

3. Brassica juncea (Indian Mustard): A fast-growing option, it absorbs selenium efficiently and is perfect for short-term experiments in plant boxes.

4. Neptunia amplexicaulis (Selenium Weed): This lesser-known species thrives in selenium-rich environments and adds diversity to your display.

For optimal results, use well-draining soil mixed with selenium salts and ensure full sun exposure. These plants not only highlight selenotropism but also contribute to soil remediation studies. By incorporating them into outdoor plant boxes, gardeners can create a living laboratory to explore plant adaptations in extreme conditions.