Creating a citronella garden in outdoor plant boxes is an excellent way to naturally repel mosquitoes while adding beauty to your space. The best plants for this purpose include Citronella Grass (Cymbopogon nardus), which is the most effective mosquito repellent. Lemon Balm (Melissa officinalis) and Lavender (Lavandula) also emit strong scents that deter pests. Marigolds (Tagetes) and Basil (Ocimum basilicum) are great companions, offering both pest control and culinary benefits. For shaded areas, consider Catnip (Nepeta cataria), which is surprisingly effective. These plants thrive in containers, require minimal maintenance, and enhance your outdoor living area. Choose well-draining soil and ensure adequate sunlight for optimal growth. Rotate plants seasonally to maintain a vibrant, functional garden.