Flies can be a persistent nuisance in outdoor spaces, but certain plants naturally repel them, making them perfect for outdoor plant boxes. Here are the top plants to keep flies at bay:

1. Basil – This fragrant herb not only enhances your cooking but also deters flies with its strong aroma. Plant it in sunny spots for best results.

2. Lavender – Known for its calming scent, lavender is highly effective at repelling flies and other insects. Its purple blooms add beauty to any garden.

3. Marigolds – These bright flowers contain pyrethrum, a natural insect repellent. They’re easy to grow and thrive in outdoor planters.

4. Rosemary – A versatile herb that keeps flies away while adding flavor to dishes. It prefers well-drained soil and plenty of sunlight.

5. Mint – The strong scent of mint confuses and repels flies. Be sure to grow it in containers, as it can spread aggressively.

6. Lemongrass – Contains citronella, a well-known natural insect deterrent. It thrives in warm climates and requires minimal care.

7. Catnip – Surprisingly effective against flies, catnip is a low-maintenance option for outdoor plant boxes.

For best results, combine several of these plants in your outdoor boxes to create a natural fly barrier. Regular pruning and proper sunlight will ensure they remain healthy and effective. By incorporating these plants, you can enjoy a fly-free outdoor space without relying on harsh chemicals.