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Cedar or composite raised beds?

Cedar and composite (recycled plastic and wood fibre) raised beds compared on the sizes and materials makers publish and what extension services say about cedar’s lifespan.

Which suits you

Cedar

Cedar suits a natural wood bed, or one you build yourself.

Composite

Composite suits a kit bed made partly from recycled plastic, or one you raise level by level; compare the makers’ warranties, since no extension service publishes a lifespan for it.

This compares what makers publish and what extension services say. It is not a test of any bed.

12 in24 in36 in7.25810.51414.522.52931.53233.2355.510.51116.522CedarComposite
Every published height in each group, on one scale. The scale is in inches.

Side by side

MeasureCedarComposite
In our catalogue11 families, 29 sizes (Gronomics, Greenes Fence, Gardener's Supply, Outdoor Living Today, VegTrug)2 families, 6 sizes (Gardener's Supply, Frame It All)
Published heights7.3 to 35 in5.5 to 22 in
Stated soil capacity3.5 to 60 cubic feet7.3 to 29.3 cubic feet
Material, as publishedCedar heartwood, decay-resistant above ground (USDA Forest Products Laboratory)Recycled plastic and reclaimed sawdust with aluminum corners (Gardener’s Supply); 38% HDPE plastic and 62% wood fibers (Frame It All)
Lifespan, as published10 years or more for cedar (UNH Extension); untreated wood can begin to decay within a few years (WSU Extension)No extension service figure; compare the makers’ warranties
Building your ownYes, from lumber; see the 4 × 8 planSold as kits in our catalogue

See the beds

References