Composting in Arizona — the desert doesn't compost like Oregon.

Why standard compost piles fail in AZ

• Low humidity = constant moisture loss; the pile dries out before it heats up.
• Summer pile temperatures hit 150°F+ from direct sun, killing the bacteria you're trying to grow.
• Carbon sources (browns) are scarce in the desert — no leaf drop in fall.
• Open piles attract pack rats, javelinas, and roof rats.

Method 1: covered pile composting

Best for: yards with regular green waste and at least a half-shaded spot.

• Use a closed plastic tumbler (Lifetime, Yimby) or a sealed bin — not an open ring.
• Locate in part shade (east-facing or under a tree).
• 30-day mix target: 2 parts green (kitchen scraps, grass) to 1 part brown (cardboard, straw, dry grass).
• Water the pile every time you turn it — it should feel like a wrung-out sponge.
• Turn weekly in cool months, twice a week in summer.
• Finished compost in 60–90 days from a hot pile; 6 months from a cool pile.

Method 2: worm composting (vermiculture)

Best for: apartments, small yards, or anyone who hates turning a pile. Worms do the work.

• Use a stacked-tray worm bin (Worm Factory, Hungry Bin).
• Start with red wigglers (Eisenia fetida) — about 1 lb per 1 sq ft of bin surface.
• Keep the bin in a garage, under a covered patio, or in part shade — NEVER in direct AZ sun.
• Feed 1/2 lb kitchen scraps per lb of worms per week.
• Avoid: citrus peels, onion, dairy, meat.
• Bedding: shredded cardboard or unbleached paper, kept moist.
• Harvest finished worm castings every 60–90 days — it's the most nutrient-dense compost you can make.

Sourcing 'browns' in the desert

• Save shredded cardboard, brown paper bags, and unbleached coffee filters year-round.
• Collect tree trimmings and chip them.
• Buy a bale of straw in winter — feeds piles all year.
• Coffee shop spent grounds are technically green (high N) but a great pile booster.

When is it finished?

• Dark brown to nearly black, no recognizable food.
• Earthy smell — not sour, not ammonia.
• Cool to the touch — active piles run 130–160°F internally.
• Crumbly texture; holds shape briefly when squeezed.

Using your compost

• Top-dress beds 1" twice a year (spring and fall).
• Worm castings: side-dress 1 tablespoon around each tomato / pepper at flowering.
• Brew compost tea: 1 cup compost in 1 gallon water for 24 hours, strain, foliar spray.
• Mix into potting soil at 20% by volume for containers.