4. Industrial Corrugated Metal Planter
For an edgy, industrial, or modern rustic vibe, integrating metal into your DIY window box is a fantastic option. A corrugated metal planter combines the warmth of a wooden frame with the cool, reflective properties of galvanized steel. This contrast creates an eye-catching focal point that works beautifully on homes with brick, stone, or dark siding.
To construct this unique planter, build a sturdy rectangular frame using rot-resistant wood. Cut panels of galvanized corrugated sheet metal to fit inside the front and side openings of the frame. Secure the metal panels from the inside using heavy-duty construction adhesive or screws with rubber washers to prevent rust. Ensure you drill adequate drainage holes through the bottom wood panel and metal liner. The metallic surface will catch the sunlight beautifully, especially when paired with vibrant, deep-colored foliage like purple coleus, bright yellow marigolds, and trailing creeping Jenny.