Worm Bin Composting and Drainage Holes

Folded newspaper showing air spaces

Folded newspaper showing air spaces

There are many different approaches to worm bin composting. I see that a lot of the DIY(do it yourself) worm bin composters on the internet recommend putting in drainage holes. I have harvested several batches of vermicompost without the drainage holes. Though my bin gets quite moist it has never had enough moisture to drain out drainage holes.

I am just wondering about drainage holes because my worm bin, the Worm Friendly Habitat , is now sold with drainage holes in the bottom.  Because I have been successful without the drainage holes I hesitate to use them.  Mainly for one reason:

I don’t want the red wigglers going out the drainage holes. My experience with the Worm Factory was that lots of worms went down into the drainage tray. They seemed to like to hang out there. Once a week I would have to take the Worm Factory apart to get the worms out of the leachate and put them back into upper trays. So I want to avoid the Rubbermaid worm bin that uses 2 bins, one stacked into the other, creating a drainage area. I don’t want to have to take it apart once a week to rescue the worms that have ventured out and to make sure that it is still an aerobic environment.  This means that there is enough oxygen and that the worm bin does not smell badly.

The new Worm Friendly Habitat bin with drainage holes just sits on a tray. I wondered if the worms would come out onto the tray in the dark. Hardware cloth or screen does not prevent this. I have already experienced this. Somehow the worms go right past any hardware cloth or screen.

There are 3 issues causing too much moisture:

  1. Too many worms for the space
  2. Feeding too much food that has a lot of moisture such as melon rind
  3. Wetting the bedding too much in the beginning
Worm Bin Composting

Worms covered with moistened newspaper in dry shredded newspaper

So my bin right now has a lot of moisture but not nearly enough to go out of drainage holes and I am having to add shredded paper, egg cartons, folded newspaper or shredded cardboard to the bottom of the bin to absorb some of the moisture. I find folded newspaper works very well.  You take 2 sheets of newspaper which equals 4 pages.  Fold it in half three times.  Then you have an awkward looking folded newspaper that wants to pop up all the time.  I put that in the bottom of the bin under everything so that the weight of the stuff holds it down but it still has air between the folded pages creating a good absorbing medium with aeration.  If it gets really wet I lay it on top in the bin with the other paper covering it all up.  The worms congregate in this folded paper so it seems like they like it.There are too many worms in my bin.  They have multiplied nicely so I am going to start transferring some of them to a new bin.  The bin is also at the point of letting it sit for a while for the worms to finish the process.

In the Worm Factory when one layer is full you move it down and don’t add food anymore and let the worms finish the composting process.  This is what my bin is ready for, no more feeding just finishing the composting process.  Don’t panic because the worms won’t be fed.  I have had finished compost sitting in Whole Foods lettuce containers for months and invariably after I have removed all the worms I miss some and the cocoons so the worms live in there for months re-processing the compost and they do fine.  I am always amazed at how long they can live and grow and multiply in finished compost.  They also do fine in the Worm Factory without regular feeding, sometimes in several layers because you only feed the top layer in the Worm Factory.

Download My PowerPoint Video, an Intro to Worm Composting!

I have created an informational PowerPoint video turned into a movie, as an Introduction to Worm Composting. It is an excellent narrated presentation using my photos, text and video clips for a great Intro to Worm Composting. I give you a heads up about what mistakes I have made so you won’t have to make them yourself!

Download the Power Point/video to your computer for free.

Click on this link which will take you to Gumroad, a secure site, where you can download my products

Click on “I Want This”.  Through Gumroad you will be able to download my video.

Here is a preview of my PowerPoint video:  the Introduction and Chapter 1:

4 thoughts on “Worm Bin Composting and Drainage Holes

  1. Sandie Anne Post author

    Hi Chris,

    Thanks for the reply! I was always amazed at the number of worms in the drainage tray of the Worm Factory. It does seem that they like to be wet! And I don’t think I ever saw a dead worm in the drainage tray. It is strange.

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