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However, if a worm’s environment gets too dry, the worm can’t breathe either. Worms require their mucous-coating for proper breathing, and a dry environment can cause the worms’ bodies to dry out.
Maintaining the correct moisture levels for your worms enables them to breathe easier and find food. The right amount of moisture also enables worms to travel through composting material with ease, encourages worms to reproduce, and helps to maintain their overall health.
How to Check Bin Moisture
The “squeeze test” is good for a quick estimate of the moisture content of your bin, but a moisture meter is recommended for more precise regular testing.The squeeze test is done by taking the composted material / bedding mixture and squeezing it tightly in your hand. You can tell the bin is too wet if more than one or two water droplets ring out when the compostable material is squeezed.
The compostable material will also clump together if it is too wet, or it will feel sandy, dusty, and you might hear organic materials crumble under your fingers if it is too dry. Imagine ringing out a washcloth: the residual moisture of once-wet, wrung-out fabric is the same moisture that is ideal for worm bins.
A worm compost moisture meter is best for regular testing as it gives you a precise measurement of the moisture in your bin, alerting you when things in the bin are going haywire. The measurement they offer helps you figure out exactly what corrections need to be made in order to keep your worms in tip-top shape. Moisture meters are particularly helpful during seasonal shifts in climate or in geographic regions where outdoor conditions are particularly tumultuous.
Once the meter is inserted into the worm bed, it will indicate whether the habitat is dry, moist, or wet. Consider checking your compostable material in several different places to get an accurate moisture reading: depending on where food has been composting, moisture levels might be different throughout the bin. Try to mix and disperse materials evenly to mix and disperse moisture.
How Moist is Moist Enough?
The sweet spot (where moisture levels should be): should typically be somewhere between fifty and seventy percent moist. The sweet spot for moisture is typically whatever level of humidity you must keep your worm habitat in order to produce the healthiest, happiest worms. You will know when you’ve reached the sweet spot when your worms are reproducing, eating heartily, and look healthy.Too Wet and Too Dry: What Causes Moisture Change
Most importantly, consider what type of material you are putting into your bin. Keep a fifty-fifty balance between “greens” and “browns.” “Greens” include materials such as vegetables and fruits, and “browns” include materials that we would consider high in fiber; for example, peanut shells, shredded paper, and shredded cardboard.Moisture rich food includes high water content fruits, such as strawberries and watermelon. Both these fruits contain about ninety-two percent water per volume.
Next highest water-content fruits:
- grapefruit
- cantaloupe
- peaches
- pineapple
- cranberries
- oranges
- raspberries
- apricots
- blueberries
- plums
- apples
- pears
- zucchinis
- radishes
- celery
- tomatoes
- green cabbage
Handling Worm Bin Moisture Issues
Bin too wet
Too much moisture can hinder the oxygen from adequately flowing through your worm bin, making it difficult for your worms to breathe. If your worm bin is too wet, stop adding or limit your addition of high-moisture food. Add some dry shredded paper, coir, or peat moss to your bin.Adding a couple handfuls of newly prepared, fresh, dry bedding will help soak up much of the moisture. Make sure to mix dry materials in, distributing the dry bedding to moist areas as needed.
Be warned: there may be a foul smell if the bin is too moist.
Bin too dry
If your worm bin is slightly dry, place a layer of moist full sheets of newspaper over your worms’ food and bedding mixture. Re-dampen the moist newspaper cover with a spray bottle as needed and let your worms snack on some high-moisture foods.If conditions in your bin are very dry, you can add a little bit of water to the feeding tray. Use a misting spray bottle for this, as it is easy to accidentally overwater your bin when you try to apply water directly.
The water you are adding should slowly trickle down to the lower trays. Pay attention to the progress of the moisture as you add the water to your worm bin. Note how the additional water is changing the moisture of the bedding and adjust accordingly.
Additional Considerations
Pay attention to changing seasons and shifts in climate. For example, when summer starts warming up the earth and temperatures outside rise steadily to constant eighty-degree days, and meanwhile, your worms are exposed to direct sunlight, this could dry out your bin.Likewise, pay close attention during rainy seasons. This is especially important if your worm bin is permanently or nearly always outdoors.
This being said, be aware of the moisture in the area you place your worm bin in regards to moisture. If it’s continually too dry, consider getting the bin out of the sunlight and into the shade (or if it’s too moist, move it into the light!). If it’s constantly too moist, consider moving it to a more well-ventilated area.
We offer a worm composting moisture meter for sale in our shop. Consider picking one up today and making sure your worms stay in the best possible health!
Article by Natalya Cowilich
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