15.75" Height Zero Flex Weathering Steel Planter

15.75" Height Zero Flex Weathering Steel Planter Panels

The versatile middle ground in the Zero Flex lineup. Straightcurve's 15.75" panels deliver the same contractor-grade rigidity and clean top-lip profile as our other heights, in a mid-height format that's ideal for accessible raised beds, tiered landscape designs, and retaining walls where a full 22" would be too tall.

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 — You are here. Mid-height option, great for accessible gardening and tiered designs
• 22" Height — 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

• Mid-height raised garden beds and planter boxes
• Accessible and low-effort garden beds
• Tiered landscape and terrace designs
• 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" and 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

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 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)

• 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 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.