We love mice, as long as they’re in a children’s book. Out in the real world? Not so much.
Mice are associated with everything from Lyme disease to hantavirus. Many of the diseases they transmit are harbored in their feces and it’s hard to top the disgusting feeling you get finding tiny, black mouse cylinders all over a kitchen counter. Don’t think the disease potential is bad or only doesn’t happens outside the dusty southwest? Read this poor fellow’s story.
You probably do a good job keeping mice from inside your home. But keeping mice out of your compost is a different proposition.
Compost piles can be home to all kinds of creatures, some good, some bad. They are especially attractive to mice — and rats — in the winter. In the summer, when compost is being turned frequently and kept moist for ideal composting conditions, mice and rats will choose to live elsewhere, visiting your heaps only for kitchen scraps or other food that might glean.
In winter, a compost heap has everything a mouse needs. It provide superior insulation against the cold and may even provide some-self-generated heat. Compost piles tend to be drier in the winter when they’re not being turned and watered, which makes them even more attractive to the little critters. Best for the mice, a compost heap can be a source of fresh food, especially if you’re still throwing your kitchen scraps into it all through the winter.
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Sealing up a compost pile to keep mice out is a frustrating endeavor. They can crawl through a gap no bigger than a penny and, persistent little buggers that they are, will chew their way or tear aside window screen you might tack around the bottom of the box. Just when you think you’ve done a good job sealing in your pile with screen and keeping them from burrowing in through the bottom, they learn to simply crawl up the side of the frame and drop in from the top.
The best solution of course, is to contain the pile in a barrel that’s elevated from the ground. I’ve never had a problem with mice in my compost tumbler. But I have in the three heaps that stand nearby. Some commercial compost containers are better at keeping out rodents than others.
Most sources suggest that the best you can do keeping mice from a big, open compost heap is to make the heap less attractive to them. If that doesn’t work, it’s time to set traps. But before you do that, here are some suggestions:
- Mice don’t like wet bedding conditions. Soak your pile well in the fall when mice are moving out of the surrounding terrain and in to your pile. Take advantage of warm snaps, if possible, to wet down your pile some more.
- Mice don’t like disturbance. Take advantage of warm snaps and thaws to turn your pile the best you can.
- Don’t put food scraps in the compost heap during winter. Instead, convert kitchen waste to soil amendments using indoor vermicompost bins or a bokashi bucket.
- Use a lid or tarp to cover your compost. This may not keep them from getting in the pile if they want but will reduce air circulation, something you want during the compost season but not so much during the dormant, winter months. They won’t like it.
If you do need to set traps, use precaution. We won’t enter the live trap — kill trap debate other than to say sometimes you just have to do what you have to do (especially when mice are in your home). No matter which kind of trap you use protect yourself from the possibility of touching the mouse or fecal matter. Wear gloves and long sleeves. A breathing mask is a good idea to avoid breathing fecal dust that might be in the air, especially important when sweeping out a garage suspected of having mice. Dispose of the mice properly, in a sealed plastic bag — double bagged and knotted plastic grocery type bags will do if you have them.
We have a buddy who is one of those casual composters who lets his piles grow big and sit for years before he screens them and spreads the compost in his gardens. He claims that the best remedy for mice is to coexist. Mice need a place to live, too, he says, and after all they don’t really do any harm and may even help the compost. That’s when we tell him about the northward spread of hantavirus and the general spread of Lyme disease. We think he’s starting to listen.
Eric Vinje founded Planet Natural with his father Wayne in 1991, originally running it as a grasshopper bait mail-order business out of a garage.
Eric is now retired, but is still a renowned gardener known for his expertise in composting, organic gardening and pest control, utilizing pesticide-free options, such as beneficial insects.
Eric believes when you do something good for the environment, the effects will benefit generations to come.
Recommended Products
Live Mouse Trap
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Bokashi Bucket w/ Starter
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Rodent Granules
This easy to apply, non-toxic formula is SAFE to use inside your home or out.
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7 Responses to “Keeping Mice From Your Compost Heap”
What about sprinkling peppermint oil around and inside the composter… or composting excess peppermint plants and clippings… don’t know about rats, but mice will not nest anywhere near it.
Last year I had a piile of old sod that the mice made into their home. This year I’m going to spread compost out and get the garden rototilled before winter so any temptation for them is buried. I thought of putting peat moss or straw on top after tilling but not if it will attract mice and I’m sure it will. I might add straw before tilling just to help with the stink of the compost.
As Robert Hood said use peppermint essential oil. Dilute with water and spray it or drip the oil directly on the dry contents of your compost once a week or so. Rats and mice hate the smell, but to humans, it makes the compost smell lovely. No need to buy therapeutic-grade oil, just buy the 4 oz size (or larger) of regular-grade (sometimes called aroma-therapy-grade) peppermint essential oil
The peppermint works, but fades quickly. I used double thickness of heavy aluminum foil, sandwiched with 2″ of dry lime and another layer of foil, crimping the edges down. Vermin HATE walking on foil but once they hit the lime – no more rats or mice the whole season! Worked for me…
Dear Tina – This sounds great. Mice are sweet, but they carry some nasty bugs that also infect humans. Can you tell us more about this process you invented?
So building from the bottom, what comes first, the two layers of AL foil? Then the 2″ of dry lime, then the 3rd layer of AL foil, crimping it around the edges to enclose the lime? Then the composting materials on top?
Thank you, HHU
Can you add a photo to explain your technique please.
Has anyone used a metal garbage-can like composter with perforated walls and bottom, supported above the soil by piping? It seems to solve the mice, etc., problems. How does it do with the actual composting? Must get pretty hot in the summer. Perhaps the lid is set aside then. HHU