Steel

Steel isn’t just for skyscrapers. At Planters Unlimited, we’ve reimagined this alloy as the backbone of commercial landscaping, offering Corten and powder-coated steel planter boxes that can withstand decades of coastal storms, foot traffic, and artistic scrutiny. Whether you’re framing a luxury hotel entrance or anchoring a rooftop farm, these metal rectangular planters and steel flower pots merge raw durability with refined aesthetics. Choose between Corten’s ever-evolving rust patina or powder-coated crisp colorfast finishes. Both choices are impervious to warping, shrug off scuffs and scratches, and can handle extreme temperature swings without cracking.

The Metallurgy Behind the Magic

What gives these custom metal planters their unique look and durability? Corten Steel’s magic lies in what it doesn’t need⏤paint. When exposed to moisture, it forms a self-protecting patina that halts corrosion. These steel planter boxes’ living finish evolves from gunmetal gray to warm terra-cotta tones over time. (Pro-tip: You can accelerate the process with saltwater sprays for coastal projects.) 


Our powder-coated alternatives undergo a 5-stage preparation process that includes thorough cleaning and sandblasting, followed by the application of a rust- and corrosion-resistant powder finish. The result? A finish tougher than automotive paint⏤, scratch resistant, UV-stable, and available in a pristine white, matte black, and statuary bronze.


But it’s not just about looks. Both steel types are highly resilient and heavier than their fiberglass counterparts. That heft isn’t a burden⏤it’s intentional. The weight of these steel planter boxes helps stabilize trees in windy plazas and deters theft in high-traffic areas.

Customization Beyond the Cut Sheet

Need a massive 72”x72” Corten square for a civic monument? Or how about a slender 18”x60” powder-coated rectangle for a rooftop herb garden? Our metal rectangular planters are made-to-order, with lead times beating almost all competitors by weeks. 


These custom metal planters and steel flower pots come with so many customizable options beyond size, including:


    •   Drainage: You can get pre-drilled holes for parks or watertight liners for indoor atriums.

    •   Anchoring: We can weld steel tabs for concrete bolt downs and add recessed forklift pockets.

    •   Finishes: We’ve coated steel planter boxes in municipal greens for city parks, metallic coppers for tech campuses, and more.

 

Of course, this is just a small list of the possible customizations we can do with our planters.

Why Steel Dominates High-Stakes Projects

Let’s be honest⏤, budgets get approved faster when longevity is proven. You can rest easy that our steel planters have been thoroughly stress-tested beyond normal standards. 


On top of that, maintenance is a non-issue. Corten requires no upkeep beyond occasional debris removal. Powder-coated units clean up with a garden hose⏤, no scrubbing, salt residue or bird droppings. For urban areas, this matters. Essentially, these steel planter boxes are long-lasting, easy to maintain, and visually appealing.

Ready to Upgrade to Steel?

Are you ready to experience the difference our Corten steel and powder-coated planters make? Request a quote today, and we’ll get back to you fast! If you have any questions about our steel collection, the customization options we offer, or our other planters or products, don’t hesitate to contact us.

Frequently Asked Questions

What are the advantages of steel planter boxes?

Our metal rectangular planters offer remarkable durability and stability, all while providing stunning aesthetics. These commercial planters resist cracking and warping, and their substantial weight makes them a perfect fit for outdoor areas where wind is an issue. They’re theft-resistant, too.

 

What is the difference between Corten steel and powder-coated steel?

Corten steel is a unique material that develops a self-protecting patina as it ages. While its color and finish evolve to look beautifully weathered, Corten actually avoids corrosion. On the other hand, our powder-coated steel planter boxes are finished with a corrosion-resistant powder that’s tougher than auto-grade paint. This makes them exceptionally resistant to scratching and the harmful effects of UV rays.

 

How do I maintain steel planters?

Because of the way we fabricate our pieces, our custom metal planters are easy to care for. Since the natural weathering of Corten is one of its best features, these units don’t need to be scrubbed clean. Just remove debris as needed. For powder-coated planters, only an occasional rinsing is required.

 

Is it hard to reposition steel planter boxes?

While the weight of steel planters can be a big advantage, they are more challenging to install and move around than other planters. If you expect to reposition yours frequently, you can order your planters with recessed forklift pockets to make the process easier. You might also consider our fiberglass or fiberstone planters if you want lighter weight with solid durability.

 

Should I add drainage to a steel planter?

If your planters are outdoors, adding drainage is recommended. It prevents standing water and helps deep-rooted plants thrive. And if you get a lot of rainfall, drainage holes are a smart addition. Indoors, it’s better to skip the drainage to avoid damaging your flooring.

 

Do I need a liner for a steel planter?

If your custom metal planters are strictly outdoors and you’ve added drainage holes, then no. A liner would prevent excess moisture from draining away from the soil. For indoor placement, liners can help protect the surrounding spaces and make it easier to lift out plants for repotting. We offer liners designed to fit metal rectangular planters and a range of other shapes and styles.

 

Can steel planter boxes be placed in full sun?

Yes. While steel tends to absorb heat when it's in direct sunlight, it doesn’t have to harm your plants. Choose a deep planter to provide plenty of insulation from the soil. Lighter finishes will help protect your plantings and keep steel flower pots cooler to the touch.

 

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