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Keep your compost pile from smelling bad

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1The wrung-out sponge test

Moisture should sit at roughly 40 to 60 percent — too little and the organisms doing the work slow down; too much and water pushes out the air, creating the airless, anaerobic conditions that actually cause bad smell. Pools of water at the bottom of a bin, or an unpleasant odor, both mean too wet: mix in dry newspaper or cardboard and stop adding wet scraps like fruit until it balances out.

2A hot pile is a working pile

The centre of a properly built heap climbs to somewhere around 110 to 160°F within days — sources give slightly different ranges, but all agree that heat is the sign of active decomposition, and that heat also kills off many weed seeds and disease organisms in the hottest zone. Turning the pile weekly keeps oxygen flowing and regenerates that heat instead of letting it stall.

3It starts acidic and ends closer to neutral

Fresh compost runs acidic, around pH 4.0 to 4.5, and climbs to about 7.0 to 7.2 by the time it's finished — useful context if a test partway through looks alarmingly sour. Settling of the pile is itself a sign the process is working correctly.

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4What actually goes in

The organic matter itself — leaves, grass clippings, garden refuse — binds clay soil into workable crumbs, helps sandy soil hold water and nutrients, and feeds the soil microorganisms that release nutrients back to plants. It's also simply a legal disposal problem solved: several states ban yard waste from landfills, making a home pile the easier option, not just the greener one.

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