Wood rot is a common issue for outdoor plant boxes, but with the right precautions, you can extend their lifespan significantly. Here are some proven methods to prevent wood rot:

1. Choose Rot-Resistant Wood: Opt for naturally durable woods like cedar, redwood, or pressure-treated lumber, which resist moisture and decay.

2. Apply a Waterproof Sealant: Use a high-quality waterproof sealant or wood preservative to create a protective barrier against moisture. Reapply every 1-2 years for best results.

3. Elevate the Plant Box: Place your plant box on bricks or feet to improve airflow and reduce ground moisture contact.

4. Ensure Proper Drainage: Drill drainage holes at the bottom to prevent water from pooling, which accelerates rot.

5. Regular Maintenance: Inspect your plant box periodically for signs of wear, cracks, or mold, and address issues promptly.

By following these steps, you can keep your outdoor plant box sturdy and rot-free for years to come.