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 4x8 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 3x a week in summer.