What's the best way to anchor a planter box on a concrete surface?

You’ve finally found that perfect planter box—handsome, roomy, and full of your favorite flowers or herbs. You set it on the concrete patio. It looks great. Then a gust of wind comes, and suddenly your beautiful planter is doing a clumsy waltz across the slab. If you’re tired of chasing your planter after every storm, it’s time for a permanent solution.

The best way to anchor a planter box on concrete isn’t complicated. In fact, I’d argue it should feel effortless. Forget drilling deep holes or mixing buckets of concrete—unless you want to make this a weekend-long project. For most of us, the smartest approach is a combination of heavy-duty adhesive and metal brackets.

First, lift your empty planter and clean the concrete spot thoroughly. Any dirt or dust will sabotage even the strongest glue. Dry it well. Next, apply a high-strength outdoor construction adhesive—I’m partial to polyurethane or epoxy-based ones—to the bottom edges of the planter. Place it firmly on the concrete and let it cure for 24 hours. This alone can stop a moderate breeze from moving your planter.

But if you live in a windier area, or your planter is tall and top-heavy, you’ll want backup. Get a set of galvanized steel L-brackets. Screw one end into the planter’s lower side (from the inside, so it’s hidden) and the other into the concrete using masonry anchors. It’s like giving your planter a firm handshake with the ground. The brackets, combined with the adhesive, create a grip that’s almost impossible to break.

One last tip from me: don’t forget drainage. If you anchor the bottom completely flat with adhesive, water might pool. Use small rubber spacers underneath the planter before gluing, or choose brackets that lift the planter slightly. Your plants will thank you, and your planter will stay put through rain, wind, and enthusiastic dogs.

Now you can stop worrying about your planter rolling away. It’s locked in. Simple, sturdy, and all yours.