How do I prevent window box rot?

When it comes to the prevention of window box rot, it can greatly expand the life of a window box. Decay-resistant woods, such as cedar, are naturally resistant to rot. Using plastic liners is a great way to create moisture barriers. Maintaining proper drainage and keeping the box elevated can help protect from having water accumulate, which will eventually damage the structural integrity of the box.

Apply protective measures year-round before the cold of winter. When treating wooden boxes, consider marine-grade varnish. Ensure that all joints and corners are sealed and covered again after particularly challenging weather seasons. A copper-based sealant will provide additional protection against fungal growth in damp climates.

Be sure to ventilate to avoid flooding. Drill ½" holes every 6" year-round. Use mesh screens on holes to prevent soil erosion. Add gravel about 2" below soil. Elevate using plastic feet for air circulation.

Use plastic liners as moisture barriers between the wood and the soil. Line boxes with plastic liners to fit snugly within. Make each corner overlap by 2 inches. Using the same drainage holes as in the box, create drainage holes in the liner. Change the liner every 2-3 years to keep it from breaking down.

Routine Maintenance identifies early signs of rot. Each month, examine the larger boxes for soft areas or discoloration. Use a screwdriver and push it into suspect regions. If the area "gives," replace the damaged area immediately with epoxy wood filler. Ensure the boxes are fully dry for at least two weeks before replacing any sealants.

Read the full article: Ultimate Guide to Window Box Plants