20 Best Tips

Making a Worm Jar at Home (and a Free Science Printable)

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How to make a worm jar


What kid wouldn’t like the opportunity to bring a bunch of worms into the house? Especially when there is a little bit of science fun tied into it!


The purpose? To see how (and if) worms compost, dig tunnels and mix soils.

While I may not be as thrilled as the kids at the prospect of worms possibly being on the loose in the house, this is really a simple but fun science activity to do with the kids. (And don’t tell the kids, but I think it’s fascinating too!)

worm jar 1

How to Make a Worm Jar

If you’d like to try making your own worm jar at home, you’ll need to gather the following:

  • a quart size canning jar
  • a lid with holes in it
  • dirt/soil/hay/grass
  • worms
  • dark colored felt or paper

1. First, layer a few different types of dirt in the canning jar – rich soil from a garden (or potting soil), lighter sand, mulch and repeat the layers (soil, sand, mulch, soil, sand, etc…).

2. Once the jar is filled, have fun digging for worms outside! Add them to the top of the jar.


3. Add some food for the worms to compost: teeny tiny chopped carrots, celery greens, chopped apples, etc.

4. Make sure the soil is slightly damp. Put the lid on the jar and and wrap it in a piece of dark felt or construction paper so the worms have darkness to work in. You may want to consider putting it inside a cabinet to give it a cool, dark place (just don’t forget about it!).

5. Every few days, for the next several weeks, continue to check on the worm jar and see how your underground friends are doing – and if they are actually working!

Worm Jar instructions and observation sheet



6. Use the simple worm jar science notebooking sheet to make predictions and observations on the worms’ activities.

Books for Learning About Worms

Fun Worm Facts

Here are a few things that we’ve had fun learning about worms:

  • The only place where earthworms don’t live are in the desert or where the ground is frozen.
  • Earthworm poop is called ‘castings’.
  • Worms have two layers of muscles ~ one that runs lengthwise and one that runs around, helping its body stretch and contract.
  • Worms have a coat of slimy mucus that helps them glide through the dirt.
  • Sunlight can kill a worm because they are sensitive to the UV radiation.
  • Worms are sensitive to temperature and touch.
  • Worms do not have ears, rather they ‘hear’ by sensing vibrations.

worm jar 2

Here is a peek at our jar after 3 days. Can you see one of our worm friends near the top of the jar? See how our soil is already mixing? We had to add a little water/moisture to the jar to help the worms out a bit.

After two weeks there were no obvious layers anymore. Our worms had been hard at work mixing and composting our soil. After we observed them, we took them back to our garden and let them do their work around our vegetables. :)

Additional Worm Learning Fun


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  1. Mine grew some really nice mold! The worms were still alive, so I let them out.

  2. Tara Henderson-Kerwin says

    My 4 yr old daughter and I have a bin of composting Red Wiggler worms. they eat our veggie and paper scraps and make castings for our garden. She is in charge of what goes into the food bin, and helping me journal the results. She loves it when we open the bin to feed them and she gets to count the worms and try to see what food is left from the last feeding.

    • I really want to do a larger one!! I think it would be great! Where did you get your worms (locally?).

    • Tara Henderson-Kerwin says

      We live in Buffalo NY. I went to a local garden center and she referred me to a lady that gives them away. I am part of a worm group on facebook, they have a list of state by state worm suppliers.

      The i just bought my plastic storage bins at walmart and my daughter helped me drill the air holes and collect the food scraps.


    • Thanks for sharing the group – definitely need to check that out!

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