Ants can be a persistent nuisance in outdoor plant boxes, but certain plants naturally deter them without harsh chemicals. Here are the top plants to keep ants at bay:

1. Mint – Its strong scent overwhelms ants, making it a powerful repellent. Plant peppermint or spearmint around the edges of your boxes.

2. Lavender – Ants dislike its fragrance, and it adds beauty to your garden.

3. Rosemary – This aromatic herb repels ants while being useful in cooking.

4. Marigolds – Their pungent smell deters ants and other pests.

5. Tansy – A lesser-known but effective ant repellent with bright yellow flowers.

For best results, plant these near entry points or mix them among vulnerable plants. Regular pruning and watering will enhance their repellent properties. Avoid over-fertilizing, as excess nutrients can attract ants. By incorporating these plants, you’ll create a naturally pest-resistant outdoor space.