15.75" CorTen Steel Modular Raised Garden Bed - Weathering Steel

Build the perfect raised garden bed for your space with ultimate flexibility. Straightcurve's 15.75" Modular Planter system features premium CorTen weathering steel panels that connect in endless configurations, delivering professional-grade depth for a wide variety of vegetables, flowers, and landscape features.

Why Choose 15.75" Modular Planters?

• Versatile Growing Depth: 15.75" height accommodates most vegetables, perennials, and root crops
• Unlimited Configurations: Mix and match 6 different panel lengths to create custom shapes and sizes
• Living Finish: CorTen steel develops a beautiful rust patina that protects against corrosion while adding warmth
• Safe Design: Folded lip eliminates sharp edges for safer installation and maintenance
• Professional Quality: 2mm thick weathering steel with 1.8" top lip by Straightcurve

Note: Weathering steel panels arrive in their natural pre-weathered state (black/gray) and will develop their signature rust patina once exposed to the elements. Rusting time varies by climate.

Choose Your Height

Not sure if 15.75" is right for you? We offer three heights to match your growing needs:

• 9.5" Height - Ideal for herbs, lettuce, and shallow-rooted plants
• 15.75" Height (this product) - Perfect for most vegetables and perennials
• 22" Height - Best for deep-rooted crops like tomatoes, carrots, and root vegetables

Perfect For:

• Medium-depth raised garden beds for vegetables and perennials
• Retaining walls (single wall or closed shapes)
• Outdoor furniture bases and storage boxes
• Square or rectangular freestanding beds
• Long garden barrier beds
• Hard surface installations (patios and rooftops)
• Custom tables and bench seats (add your own top)

Panel Specifications

Available Panel Lengths: 6 different sizes to choose from (select from variants)

• Height: 15.75" (400mm)
• Thickness: 2mm steel
• Top lip: 1.8" folded edge
• Material: CorTen weathering steel

Connector & Corner Options

Straight Joiners
Used to connect two panels horizontally, extending either width or height of your planter.

Closed Corners
Create traditional rectangular or square planters with 90° corners.

Open Corners
Design L-shaped planters and custom configurations.

Bracing Requirements

When do you need bracing?

• No bracing needed: Square or rectangular planters with 4 panels, each side under 47.25", with no straight joiners
• Bracing required: Any panel exceeding 47.25" width, or when using straight joiners between parallel panels
• 78.75" panels: Require 1 large anchor post + 1 anchor set

Bracing Options:

• Universal Bracing Strap: Works for panels up to 47.25" wide (used between parallel straight joiners)
• Universal Brace (Turnbuckle Style): For panels wider than 47.25" - hooks to straight joiners
• Large Anchor Post + Anchor Set: Alternative for wider panels or added stability

Installation Made Easy

📹 Watch the Installation Video:

Download Complete Installation Guide (PDF)

Frequently Asked Questions

Q: What's included with each panel?
A: Each panel is sold individually. Connectors, corners, and bracing are sold separately so you can customize your exact configuration.

Q: How do I calculate how many panels I need?
A: Measure your desired planter dimensions. For a simple rectangular bed, you'll need 2 panels for length + 2 panels for width, plus 4 closed corners and straight joiners if stacking height.

Q: How long does the rust patina take to develop?
A: Typically 3-6 months depending on your climate and weather exposure. Wet climates rust faster than dry climates.

Q: Can I use these on a rooftop or patio?
A: Yes! These are perfect for hard surface installations. The rust patina is stable and won't stain once fully developed.

Q: What's the soil capacity?
A: Varies by configuration. A 4'×8'×15.75" bed holds approximately 32 cubic feet of soil (about 1.2 cubic yards).

Need Help Planning Your Project?

We know all these choices can be overwhelming! Our team is here to help you design the perfect configuration and ensure you have all the parts you need.

Contact us:
Phone: 540-219-1758
Email: info@

We'll help you calculate exactly what you need for your custom design.