Creating a vibrant kaffir lime garden in outdoor plant boxes requires careful selection of companion plants that thrive in similar conditions. Kaffir limes (Citrus hystrix) prefer well-draining soil, ample sunlight, and moderate humidity, making them ideal for outdoor containers. Here are the best plants to pair with them:

1. Lemongrass – A natural pest deterrent, lemongrass complements kaffir lime with its grassy texture and citrusy aroma.

2. Thai Basil – This herb thrives in the same warm conditions and enhances the flavor of dishes using kaffir lime leaves.

3. Mint – Easy to grow and perfect for repelling insects, mint adds freshness to your garden.

4. Marigolds – These colorful flowers attract pollinators while deterring harmful pests.

5. Dwarf Citrus Varieties – Plants like calamondin or Meyer lemon can share space without competing aggressively.

For optimal growth, ensure your plant boxes have proper drainage and are placed in a sunny spot. Regular pruning and organic fertilizers will keep your kaffir lime and its companions healthy. Happy gardening!