The Clever Korner

My compost pile just sits there — or it stinks

A pile that does nothing and a pile that stinks are opposite failures with the same two variables behind them: the carbon-to-nitrogen ratio, and water.

4 that work5 options weighed0 to avoid

What actually works

◇ Plausible
The black soldier fly composter

If what you actually have is a kitchen-scrap problem and chickens to feed, this is the better machine — and the larvae harvest themselves.

$40–150
◆ Proven
Fix the carbon-to-nitrogen ratio

Target **25:1 to 30:1**. Too much carbon (straw, leaves, sawdust) and it sits there cold for a year. Too much nitrogen (grass, manure, kitchen scraps) and it goes anaerobic and reeks of ammonia. The calculator below does the blend.

◆ Proven
A cubic yard, minimum

3 × 3 × 3 ft. Smaller than that and the pile loses heat faster than it makes it, no matter how good the recipe.

◆ Proven
Wrung-out-sponge wet

Too dry is the most common reason a correctly mixed pile does nothing, and it's invisible from outside. Squeeze a handful.

◆ Proven
A long-stem thermometer

$12–25. The core is 18 inches in; the edge tells you nothing. **131°F held three days** is the figure for killing weed seed; above 160°F turn it.

Run the numbers

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