Raised beds for high-desert gardens — print version.
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SUS Farms · Utah Gardening
Raised beds for high-desert gardens
beds · beginner · ~5 min read
Raised beds aren't about looking nice — they're a workaround for native soil that drains poorly, cooks tender roots, or holds salts. In Utah they're especially useful because we can replace the alkaline native dirt with a controlled mix and amend without trying to fix five acres at once.
The 48-inch rule
A raised bed should be at most 48 inches wide. That's arm-reach from each side without stepping in. Step in once and you've compacted the soil — every step undoes a season of root development.
Soil mix
Our recipe: 50% topsoil (screened), 30% finished compost, 10% coarse sand or perlite, 10% peat or coir. The peat lowers pH and improves moisture retention; the sand prevents compaction. A 4×8 bed at 12" deep needs about 32 cubic feet of mix — call it 1.2 cubic yards.
Edging — what to avoid
Pressure-treated lumber leaches preservatives into food beds. Railroad ties are creosote. The right answer is untreated cedar, redwood, or concrete block. Cedar 2x10s last 8–12 years untreated. Block is forever.
Drip line at surface, mulch on top
Drip line laid on the soil surface, 2 inches of straw or wood-chip mulch over it. The mulch shades the line, holds moisture, and suppresses weeds. Run drip 30 minutes 3× a week in summer.