Yes, you can grow aquatic plants in an outdoor plant box, but it requires careful planning and the right conditions. Aquatic plants thrive in water-rich environments, so your plant box must be able to retain water effectively. Choose a sturdy, waterproof container or line a wooden box with a pond liner to prevent leaks.

Select plants suited for outdoor conditions, such as water lilies, duckweed, or hornwort, which adapt well to varying temperatures and sunlight. Ensure the box receives partial to full sunlight, depending on the plant species, and maintain clean water to avoid algae buildup. Regular pruning and fertilizing will keep your aquatic garden lush and healthy.

For deeper boxes, consider adding a small pump or aerator to improve water circulation, especially if you include fish or other aquatic life. With proper care, an outdoor plant box can transform into a vibrant mini aquatic ecosystem, enhancing your garden’s beauty.