Root rot is a common issue for plants grown in outdoor plant boxes, but with the right care, it can be prevented. Here are some key strategies to keep your plants healthy:

1. Ensure Proper Drainage: Use plant boxes with drainage holes to avoid waterlogging. Add a layer of gravel or perlite at the bottom to improve water flow.

2. Choose the Right Soil: Opt for well-draining soil mixes designed for outdoor use. Avoid heavy soils that retain too much moisture.

3. Water Wisely: Overwatering is a leading cause of root rot. Water only when the top inch of soil feels dry, and adjust based on weather conditions.

4. Monitor Plant Health: Regularly check for signs of root rot, such as yellowing leaves or a foul smell. Remove affected plants promptly to prevent spread.

5. Use Fungicides Preventively: Apply natural fungicides like neem oil or cinnamon to protect roots from fungal infections.

By following these steps, you can maintain healthy roots and vibrant plants in your outdoor plant boxes all season long.