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Corten steel planter boxes built to the same standard as the fire pits — welded corners, heavy-gauge walls, and a natural rusted patina that gets richer with weather. Available in a range of sizes, with and without an interior shelf.
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Corten steel is an outdoor material in a way most metals aren't. It oxidizes to a deep amber-rust patina and then stops — the surface rust actually becomes a protective layer that slows further corrosion. The result is a planter that looks better after a few seasons outdoors than it did when it arrived, and holds its structure for decades.
Our planter boxes are welded from the same heavy-gauge steel we use for fire pits — not bent sheet metal or thin-walled stamped forms. The corners are welded, not folded and crimped. They hold their shape under the weight of soil without flexing. Available in a wide range of dimensions, each option with or without an interior shelf for added planting flexibility.
Frequently Asked Questions
What is corten steel and why is it used for outdoor planters?▼
Corten (also called weathering steel) is a steel alloy that forms a stable, adherent rust-like surface when exposed to weather. Unlike standard steel, this oxidized layer acts as a protective coating that slows further corrosion. It's ideal for outdoor planters because it gets better-looking over time and requires no painting, sealing, or coating to stay protected.
Will corten steel stain my patio or deck?▼
During the initial weathering process, corten steel does produce orange-colored runoff as it develops its patina. This can stain concrete, wood, and stone beneath the planter. We recommend placing planters on a material you don't mind staining, elevating them slightly, or using a drip tray during the first season of weathering.
What can I plant in a steel planter box?▼
Almost anything. Herbs, vegetables, flowers, small shrubs, and ornamental grasses all do well in steel planters. The heavy walls insulate roots from extreme temperature swings and the drainage keeps soil from becoming waterlogged.
How do I drain a steel planter box?▼
Drainage holes should be drilled before filling with soil. The steel is workable with a standard drill and metal bit. Drill several holes in the bottom — size and number depend on the planter dimensions and what you're growing. We recommend doing this before the patina develops.
Do I need to seal or paint a corten planter?▼
No. Corten steel is designed to weather without any coating. Sealing or painting it can actually interfere with the patina process. Leave it as-is and let it weather naturally.
Can I leave a corten planter outside year-round?▼
Yes — that's exactly what it's designed for. Corten steel handles freeze-thaw cycles, rain, sun, and snow without deteriorating the way painted or thin-walled planters do.
What sizes are available?▼
We offer a wide range of sizes from 12"×12"×12" up to 24"×24"×24" and beyond, with and without an interior shelf. Browse the full product grid above to see all available options and dimensions.
