22" Height Zero Flex Weathering Steel Planter

22" Height Zero Flex Weathering Steel Planter Panels

When you need the strongest, cleanest lines on the job site, Zero Flex delivers. Straightcurve's most robust CorTen steel edging features a thicker top lip that holds its shape under pressure — perfect for deep raised garden beds, retaining walls, and any application where rigidity matters. Build a fully enclosed planter box, a straight barrier run, or anything in between.

Zero Flex comes in three heights to suit any project:

• 9.5" Height — Low-profile edging and shallow raised beds, ideal for patios and hard surfaces
• 15.75" Height — Mid-height option, great for accessible gardening and tiered designs
• 22" Height — You are here. The most popular height for deep raised garden beds and statement planters

💡 Pro Tip: Mix Heights on Sloped Sites — All three Zero Flex heights (9.5", 15.75", and 22") can be connected together and leveled at the top. As the ground rises, step down to a shorter panel — so you're never burying more steel than necessary. A smart technique for terraced gardens, sloped retaining walls, and hillside installations.

🛠️ Use our free Planter Box Configurator to design your layout and get an exact parts list.

Note: The configurator is designed for fully closed planter boxes (square, rectangular, or L-shaped). Zero Flex is also ideal for open-ended applications — single-sided retaining walls, 2-sided corners, 3-sided U-shapes, and straight barrier runs. For those layouts, use the configurator as a starting point and adjust quantities as needed, or email us and we'll help you work out exactly what you need.

• Straightcurve's most rigid edging — thicker top lip keeps lines clean and straight
• 2mm thick CorTen (weathering steel) — built to outlast the job site
• Folded 8mm top edge — no sharp edges, bold professional finish
• Panels sold in pairs — mix and match sizes for any configuration
• Arrives in pre-rust state — natural patina develops after installation
• Not designed to be cut or rejoined — need custom lengths? See our Rigid edging instead

• Fully enclosed raised garden beds and planter boxes
• Single-sided retaining walls and garden barriers
• 2-sided corner planters and L-shaped beds
• 3-sided U-shape planters against a wall or fence
• Long straight barrier runs
• Rooftop and hard surface installations

• Large Panels — 2 x 71"
• Medium Panels — 2 x 39.37"
• Short Panels — 2 x 31.50"
• Filler Packs — 2 per box: available in 15.75", 8", and 4"
• All panels: 2mm thick, 8mm top edge
• Corners: 4" each side of the 90° bend

Choose the bracing method that suits your project:

1. Cross Bracing Strap — Best for parallel panels up to 75" wide. Straps are 40" long and break off in 2" increments; two straps can be combined for wider spans.

• 2 per Large Panel box (71" packs)
• 1 per Medium Panel box (31.5" packs)

2. Universal Bracing — Turnbuckle tie-back system. Hooks to the pole bracket on the back of the panel (bracket included). Adjustable chain pegs into the ground; tighten with the turnbuckle. Creates a constant push/pull tension once backfilled to prevent bowing.

• 4 per Large Panel box (71" packs)
• 2 per Medium Panel box (31.5" packs)

3. Large Anchor Post — 43" galvanized post that screws to the pole bracket (bracket included). Pound into the ground beside the bracket and secure with provided self-tapping screws.

• 4 per Large Panel box (71" packs)
• 2 per Medium Panel box (31.5" packs)

Create curved bump-outs and feature elements using 4" curved inserts:

• Straight Insert — 4" filler, or combine with internal/external pieces for a tighter curve
• Internal Insert — 4" section with a 15° angle for an inward curve
• External Insert — 4" section with a 15° angle for an outward curve

Download 22" Zero Flex Installation Instructions (PDF)

Use the Planter Box Configurator for closed box layouts, or email us at info@straightcurve.com for open-run and retaining wall configurations. We'll make sure you have exactly what you need.