For a composite garden bed

Gardener’s Supply Sustainable Raised Beds

Choose a composite bed made with recycled plastic and reclaimed sawdust, held by aluminum corners. Two footprints provide a low, open-bottom growing space.

2 sizes and layouts

Each size drawn from above at the same scale, with the maker’s listed capacity.

Listed capacity: 7.8 ft³
Soil to fill it: 6 bags of 1.5 ft³
Planting depth: 10.5 in

Drawn from the maker’s published figures: the footprint from above on the left, the height on the right, in inches. Every bed on this site uses the same two scales.

Side view beside an adult 5 ft 6 in tall, at one scale.

For a composite garden bed

The bottom is open to the soil below. Choose a ground location with drainage, or use a contained planter for a patio.

Style: Bed on the ground
Material: Composite of recycled plastic and reclaimed sawdust with powder-coated aluminum corners
Warranty: A lifetime guarantee on every purchase, paid as store credit for the purchase price; normal wear and tear is not covered.

Choose the size or layout

Use the widest outside footprint to plan paths. For a soil order, measure between the inside walls after assembly and choose your filled depth; advertised dimensions can be rounded. Rectangular sizes below read length × width × height.

Gardener’s Supply doesn’t publish inside measurements or an outside size for these beds, so the soil figure below is the maker’s own stated capacity. If you’ll fill it less deep, measure between the inside walls once it’s built.

Size or layout	Advertised size	Listed capacity	Bags of 1.5 ft³ for that capacity	Planting depth	Plan
3 × 3 ft	36 × 36 × 10.5 in	7.8 ft³	6 bags	10.5 in	Plan this size: 3 × 3 ft
3 × 6 ft	72 × 36 × 10.5 in	15.75 ft³	11 bags	10.5 in	Plan this size: 3 × 6 ft

Notes on these sizes

3 × 3 ft: Maker also states 235 quarts, without saying dry or liquid; the cubic feet are used.
3 × 6 ft: Maker also states 470 quarts, without saying dry or liquid; the cubic feet are used.

What to plant in it

Four planting plans drawn to scale for each size, from a salad bed to roots and onions, with every plant counted: 3 × 3 ft bed · 3 × 6 ft bed.

Prepare and assemble this bed

Compare the material, bottom and care choices if you are still deciding between families. Follow the site preparation and liner checklist for the supporting surface.

Choose the exact configuration and lay out its parts. Check the required tools in the selected kit instructions.
Prepare a stable, level position and confirm the outside footprint with working paths.
Check corners, fasteners, protective edging and any layout-specific braces against the kit instructions before adding fill.
Measure the finished inside and outside separately, then update your plan. Preserve the maker’s fill restrictions.

Mark the outside footprint on the ground before assembly, including any legs or protruding corners. Leave a route for carrying bags, reaching the plants and maintaining nearby beds.

This bed stands on the ground; its maker does not say whether it has a bottom, so look at the parts before you fill it. Check the soil and drainage where it will sit before adding fill. Its wall height is not a prescription for how deep the growing mix should be.

Choose a reachable width Measure for a soil order Compare the cost of building one