Why Turning Compost Matters
Composting is an aerobic process — the bacteria that break down organic matter need oxygen. As they work, they consume the oxygen trapped between particles. An unturned heap quickly becomes anaerobic (oxygen-deprived), producing slow, smelly decomposition. Turning reintroduces oxygen, reactivates bacterial populations, and dramatically speeds the process.
The Compost Fork
A standard 4-tine digging fork works for turning compost, but purpose-designed compost or manure forks have specific advantages:
- More tines (5–10 tines): Picks up more material per scoop, reducing number of lifts
- Rounded tine tips: Less likely to snag on roots and stalks in the heap
- Longer handle: Compost heaps are typically 1–1.2m tall — a long handle lets you work from the side without awkward bending
The Compost Aerator Tool
A compost aerator is a long rod with collapsing wings or flanges at the tip. Push it into the heap, twist, and pull back — the wings open on the upstroke and pull core material upward, creating air channels without the full effort of a complete turn. Ideal for maintaining active hot compost between full turns. Not a substitute for turning, but valuable for between-turn aeration of large heaps.
How Often to Turn
Hot composting (fast method): Turn every 3–7 days. This maintains temperatures of 55–70°C, which kills weed seeds and pathogens. Compost ready in 6–12 weeks.
Cold composting (passive method): Turn once per month minimum. Compost ready in 6–18 months depending on materials and conditions.
What to Do When Turning
Move the outer (cooler, less decomposed) material to the centre. Move the centre (hotter, more active) material to the outside. This ensures all material eventually passes through the high-activity centre zone. Add water if the heap feels dry (should feel like a wrung-out sponge), or add dry material if it smells ammonia or feels slimy.
FAQ
Can I compost in a closed bin without turning?
Yes — cold composting in a closed Dalek-style bin works without regular turning. It's slower (12–24 months) and shouldn't receive cooked food. Add a layer of torn cardboard between fresh green material additions to maintain aeration passively.