Creating a muskrat-resistant outdoor plant box requires selecting plants that naturally deter these persistent pests. Muskrats are attracted to tender vegetation, but certain plants can help protect your garden. Here are the best options:

1. Daffodils (Narcissus) – These bulbs are toxic to muskrats and other rodents, making them an excellent deterrent.

2. Lavender (Lavandula) – Its strong fragrance repels muskrats while adding beauty to your garden.

3. Rosemary (Rosmarinus officinalis) – This aromatic herb is unappealing to muskrats and thrives in outdoor planters.

4. Mint (Mentha) – While invasive, mint’s strong scent keeps muskrats at bay. Plant it in containers to control spread.

5. Marigolds (Tagetes) – Their pungent odor deters pests, including muskrats, and adds vibrant color.

For added protection, combine these plants with physical barriers like wire mesh around the plant box. Choose hardy, resilient varieties to ensure long-term success in keeping muskrats away. Happy gardening!