In the last few posts we discussed setting up and maintaining your compost pile and debunked (or at least helped you prevent) the spontaneous combustion theory. In this post, we’ll help you diagnose what is making your compost pile reek like the Swamp Thing and how to correct the problem.

Is the stench of your compost heap enough to make you faint in horror?
Once you are established, your compost should not stink. At most it should smell like damp dirt. But there are three mishaps that can lead to stinky garbage. There are ways to tell which problem you have, but my favorite (because it’s sort of like a game show quiz) is guess that smell.
Contestant number 1: this compost heap is redolant of rotten egg with a tinge of sulfur.
The problem? Remember when we talked about the different microbes that do all the work in your compost heap? There are aerobic (that is, works well with oxygen) and anaerobic (doesn’t play well with air) varieties. The aerobic work faster and they smell better too. Their anaerobic cousins prefer clouds of noxious gas.
What should you do? This compost pile needs to be turned. Especially if it is soggy. Thin materials like grass and leaves mat down in the rain, closing any air holes that might have been in your nice, fluffy pile. Turn your pile to release those stinky odors and work some oxygen back into the pile. Not only will it smell better, it will do its thing much faster. In the future, consider adding rough or bulky items such as sticks, corn cobs or even cardboard to keep those air passages open.
Contestant number 2: Your eyes water when you approach this pile and it sends out waves of ammonia.
The problem?Too much nitrogen and not enough carbon. This can happen if you’ve added a lot of green materials like kitchen scraps or grass clippings. Nitrogen needs carbon to equal it out otherwise the pile will get cold and emit a foul odor.
What should you do? Add brown or absorbant items such as leaves, sticks, straw, paper, or corncobs. This will help absorb extra moisture and reheat the pile. If you have recently added manure, back off for a while or add campfire or stove ashes in to even it out, as this too, can cause a heavy ammonia smell.
Contestant number 3: this wholly evil pile reeks of death and destruction. It’s also attracting rats and I think I saw a buzzard flying overhead
What’s the problem? Somebody put meat, bones, dairy or other animal byproducts (besides cow or horse manure) into the pile. This is bad, bad, bad. Not only will this pile be stinky and attract pests and scavengers, it can also make you sick both because of the disease carrying pests and the microbes that are growing on the meat (and by the way can infect your whole compost heap and hence, your vegetable garden- this is how horrible stories like e. coli in perfectly unassuming, friendly looking lettuce can happen).
What to do? If you are really serious about composting animal products along with your vegetables, consider Bokashi composting. What is Bokashi? It’s a fermentation technique that began in Japan and it embraces those stinky anaerobic microbes by sealing the waste in an airtight container (this also means it won’t reek and drive you insane). For a great example and walkthrough, try the Green Fingered Photographer’s blog here.
Thank you for playing guess that smell, tune in next time for more composting surprises!

Oh, so sorry compost heap, better luck next time




