Wood planter boxes can be durable, but their lifespan depends on the type of wood, exposure to elements, and maintenance. Cedar, redwood, and teak are highly durable in various weather conditions due to their natural resistance to moisture and insects. However, untreated or softwood planters are prone to rot and warping in humid or rainy environments. Regular sealing, waterproofing, and protective treatments can improve weather resistance. Covering the boxes or moving them to sheltered spots during extreme weather also extends their durability.