Wooden planter boxes add natural charm to urban gardens, but they don't last forever. Knowing when to replace them is key to maintaining plant health and your space's aesthetic. Here are five clear signs it's time for a new box.
First, inspect for structural failure. Significant warping, cracking, or boards that are pulling apart compromise the box's integrity. If it struggles to hold its shape or soil, replacement is imminent. Second, probe for soft, rotting wood. Use a screwdriver to test the wood, especially at corners and the bottom. If it pierces easily or crumbles, rot has set in, and the box is deteriorating.
Third, look for persistent mold and mildew. While surface mold can be cleaned, deep-seated fungal growth indicates constant moisture retention, which will quickly break down the wood and harm plant roots. Fourth, check for soil that collapses or drains poorly. Over time, decomposing wood mixes with soil, creating a dense, soggy environment that suffocates roots, signaling the planter is past its prime.
Finally, consider persistent pest infestations. Rotting wood attracts insects like termites and carpenter ants. If pests keep returning despite treatments, the wood itself has become a food source. Replacing the planter eliminates the habitat. For longevity with your next box, choose naturally rot-resistant woods like cedar or redwood, and always ensure proper drainage holes and a protective liner.