If you're drawn to the warm, natural appearance of wood for your urban gardening projects, cedar makes an excellent choice for planter boxes. Many gardening enthusiasts wonder about cedar's durability when constantly exposed to soil and moisture. The good news is that cedar naturally contains oils and tannins that act as preservatives, making it remarkably resistant to rot, decay, and insect damage compared to many other wood types.
Western red cedar, in particular, is renowned for its longevity in outdoor applications. When properly constructed with drainage holes and elevated slightly above ground level, cedar planter boxes can last 10-15 years or even longer. The wood's cellular structure creates natural air pockets that provide insulation and help it withstand moisture fluctuations better than dense woods.
While cedar will eventually show signs of weathering, turning to an attractive silvery-gray patina, this doesn't indicate deterioration. To extend your cedar planter's life, avoid letting soil remain constantly waterlogged and consider applying a wood-safe sealant annually. With minimal care, cedar planters offer both aesthetic appeal and practical durability for your urban garden space, beautifully aging while protecting your plants season after season.