Yes, you can grow aquatic plants in a water-filled outdoor plant box! This unique gardening method combines the beauty of aquatic flora with the convenience of container gardening. To succeed, choose hardy aquatic plants like water lilies, duckweed, or hornwort that thrive in shallow water. Ensure your plant box is watertight and placed in a spot with adequate sunlight—most aquatic plants need at least 4-6 hours of direct light daily.

Maintenance is simple: regularly top up the water to compensate for evaporation and remove debris to prevent algae buildup. Avoid overcrowding by spacing plants properly, and consider adding a small pump or aerator if the water becomes stagnant. With the right care, your outdoor plant box can transform into a vibrant mini aquatic ecosystem, adding a serene touch to your garden or patio.

For best results, use a mix of floating, submerged, and marginal plants to create visual depth and balance. Experiment with different species to find what works best in your climate and enjoy the soothing presence of water-loving greenery right outside your door.