
Garden Guides
Raised Bed Soil Mix: Two Extensions, Two Recipes
Clemson says compost at 10–20% of the bed. Utah State says a third, or 30–50% as an amendment. Both are extension advice, and the gap is real.

Raised Bed Kit
★★★★☆ 4.3/5
our editor rating how we score4.4/5 from 338 shoppers at Amazon — their number, not ours.
$180–$210 (3 × 6 ft)
Typical price · 18 sq ft of bed at 11 in deep — roughly 16 cu ft to fill
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Cedar, untreated, and three feet wide — which is the one dimension Clemson and Utah State give the same answer for.
Read this against the two specifications rather than against the category. Clemson names the materials directly for an enclosed bed: insect- and decay-resistant wood such as cypress, redwood, or cedar — and for treated lumber, AWPA labelled UC4A or higher. Western Red Cedar is the first list, and because it is untreated and unstained the UC4A question does not arise at all. The width is the more interesting match. Three feet is inside the 3-to-4-foot range BOTH sources give, and both give it for the same reason: you must be able to reach the middle from either side without stepping in, because the compaction a raised bed prevents is most of why it exists. A wider bed gives that back. On depth, 11 inches sits inside Utah State's 6-to-12 and above Clemson's 4-to-8 — which per our own guidance puts it in the case where the bed IS the root zone rather than an addition to usable ground beneath. If you dug a test hole and the spade went in easily, you are paying for depth you did not need. Two costs to be clear about. At roughly $11 per square foot of bed this is expensive against cedar boards and an afternoon, and what you are buying is the joinery — no fasteners to loosen, which is the part of a wooden bed that actually fails. And 11 inches of depth is about 16 cubic feet of fill, which at our own compost guidance is a lot of material: budget the filling, not just the frame.
Product type
Raised Bed Kit
Active ingredient
None — 1 in thick North American Western Red Cedar, untreated and unstained, tool-free assembly without screws or nails, 5 year warranty
Price range
$180–$210 (3 × 6 ft)
Coverage
18 sq ft of bed at 11 in deep — roughly 16 cu ft to fill
Best for
A bed on ground roots cannot enter, where Clemson's material list and the 3-4 ft width both matter
our editor rating
4.3 out of 5
Common questions
Infinite Cedar Premium Cedar Raised Garden Bed, 3 × 6 ft × 11 in typically runs $180–$210 (3 × 6 ft), covering 18 sq ft of bed at 11 in deep — roughly 16 cu ft to fill.
Infinite Cedar Premium Cedar Raised Garden Bed, 3 × 6 ft × 11 in targets Compacted or unusable subsoil, Poor drainage at grade, Shallow topsoil over hardpan, Soil compaction from foot traffic.
None — 1 in thick North American Western Red Cedar, untreated and unstained, tool-free assembly without screws or nails, 5 year warranty.
About $11 per square foot of bed — cedar boards and an afternoon cost considerably less
Real feedback
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