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pH of Your Soil and Worm Beds

pH and Your Worm Bed

A pH between 6.0 to 7.0 is a Good pH for worms.  pH Over 7.0 or under 6.0 can be dangerous for composting worms like Red Worms, European Night Crawlers and other composting worms. The higher the pH the more alkaline the bedding is. The lower the pH the more acidic. It is best to have bedding that is right in the middle.  6.5 is the perfect pH.

 The pH of your worm bed should read approximately 7.0. The higher the pH the more alkaline your bedding is, and the lower the pH the more acidic it is. pH can be controlled in several ways. The easiest way is to have a bag of powdered limestone on hand. You can get this here on this site, or in a feed or garden store. Water the beds, but do not soak, sprinkle the limestone on the top of the bedding and let it absorb some water. Once the water is absorbed by the limestone you can mix it in. Mixing the limestone in dry can cause the worms to burn. You will notice that the worms will writhe around in pain and then will die if the dry limestone powder touches them. Once the powder is wet just mix it in and then check the pH. If it is still too acidic repeat the process. Another way to control acid is to turn the bedding weekly. The aeration process seems to decrease the acid thus increasing pH. Feeding products like egg shells will also help reduce the acid levels.

Acid forms in the worm bed when too much grain or wheat based foods are fed to the worms. Try to use scraps of food that do not contain wheat or pulverized corn products. Too much wheat based or corn based products will sour the bedding and cause acid formation. High acid levels can also cause the formation of mites in the worm bed. A small population of mites is normal in worm beds, but a large population can indicate a high acid condition.

You can get your pH testers and Limestone here! pH Tester Link.
pH Information:
  • pH of 7 is neutral. The way pH of soil and worm bedding is measured is on a scale of 0 to 14.  pH is counterintuitive in some ways.  We naturally think of thing escalating as numbers rise. With pH the higher the number the more alkaline the worm bedding will be.  So in a worm world the pH of 5 or less is deadly.  Worms can take a bedding that is a little more on the alkaline side but if it gets too high on the scale, like an 8, you will start having issues.  Trying for 6.5 to 7 is perfect.
  • Using a pH meter is the best way to test weekly to make sure you don't have an issue.
What if you don't have a pH meter and you need to know now?
Here are some things to check;
  • Smell test. If it smells rotten and wet it's probably turning anerobic and that's bad.  Some call this protein poisoning. This is where worms start to crawl on the surface and becomed deformed, withered and eventually die.
  • Are the worms trying to escape even if they have plenty of food and clean bedding?  This is a sure sign of an issue.
If you have this issue now. You need to R.E.A.C.T.
R- Remove the lid and allow air into the bin.
E-Energize the bedding with fresh bedding. Use dried crumbled newspapers and fresh dry peat and mix it into the bedding.
A-Aerate the bedding by turning it and getting air into it.  Bad bacteria do not like the fresh air and the worms love it.
C-Circulate air around the bin to force air through it. A fan can work. Fans are not needed unless you have an emergency where worms are dying.
T-Treat the bedding with powdered limestone as soon as possible!