What kind of drainage should a wooden planter box have?

As a wooden planter box, I love holding your beautiful flowers and herbs, but I have to be honest: if my drainage is wrong, I become a soggy, moldy mess, and your plants start to sulk or even drown. So, what kind of drainage should I have? Let me tell you from my own experience.

First, I need drainage holes—at least half a dozen half-inch holes drilled into my bottom, spaced evenly about four inches apart. I prefer these holes snug but not huge; too big and soil leaks out, too small and water clogs inside. If I’m sitting on a deck or patio, please add little feet or a tray under me so air can circulate beneath—I hate sitting in a puddle of my own runoff.

Second, I really appreciate a gravel or pebble layer about an inch thick at my base. This acts like a mini reservoir and keeps the drainage holes from getting blocked by soil. But don’t overdo it—some folks pile on too much gravel, and that actually raises the water table inside me, hurting your plants’ roots. A fine mesh or landscape fabric over the gravel would be perfect; it stops dirt from escaping while letting water flow freely.

Third, consider my wood’s health. I’m made of cedar or redwood (the good stuff), but even I need a liner. A flexible pond liner or thick plastic sheet with slits cut over the holes will protect my sides from constant moisture. Without it, I’ll rot from the inside out within a couple of years—and nobody wants a collapsed planter.

Lastly, I love sloped bottom design—if you tilt my floor ever so slightly toward the holes, water won’t pool in corners. That simple gesture keeps me dry and prevents fungus from crashing my party.

So, to answer your question: I need multiple drainage holes, a gravel layer with filter fabric, a protective liner, and a slight slope. Follow these, and I’ll keep your plants happy, my wood sturdy, and our partnership flourishing for years. Remember: a dry bottom means a long, leafy life together!