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How to make a Wormery out of a Plastic Bottle

Have your kids ever wanted to see what a worm does beneath the soil? What purpose does it have and how does it do it! A wormery is an ideal way to explore what happens under the surface of the soil, and although you can buy them it’s really easy to make your own DIY Wormery from a Plastic Bottle with the kids so that they can see what the worms do before you return to them to the garden. So here you go our guide to make your own wormery with kids.

Guide to making a wormery for the KS 2 Classroom out of a plastic bottle

Materials needed to make a Simple Wormery with kids

1l or bigger Plastic drinks bottle throughly cleaned

Soil, Compost and Sand (you don’t need large quantities of any of these)

Worms from the garden

Scissors and a dark coloured bag

printable pack from Rainy Day Mum all about Earth Worms, contains journalling page to go along with creating a wormery

Want to add some extra learning and a journalling page to your wormery activity? Then check out our Earthworm Activities Project Pack. Learn about the worm life cycle and complete the My Wiggly Worm Journal Page alongside your wormery.

How to make a Plastic Bottle Wormery

First off it’s time to dig for some worms – we’re lucky that it’s the time of year to turn over our vegetable beds to prepare them for planting so as we’re turning over the beds we collected worms for the wormery – a 1 litre plastic bottle like we used will be good for around 5 or 6 worms to inhabit but if you have a bigger bottle then you could collect more worms.

girl holding a worm in her hands

If you aren’t digging over soil then a great way to find worms is to wait till after some rain and then dig up the soil – if you want to do this quicker than the next rain storm then put a hose on some soil for around 10 minutes – wait a couple of hours if it’s not too hot (in the shade is a great place to do this) and then have a dig the worms should have risen to the surface as the soil will be easier for them to move through and have more nutrients for them to get out.

making a worm from a plastic bottle

To make our wormery we cut the top off the plastic bottle using the top as a handle funnel to pour in the soil – this I had to do with a bread knife as the bottle was very sturdy.

filling a plastic bottle with sand and soil to form layers

To see the role of the worms in the soil you need to have a different collection of soils – we used soil dug up from the garden (grey in colour) compost (black) and sand (white) and filled the bottle with layers of the soil.

kids making a wormery out of a plastic bottle to see what they do in the soil

Once the bottle was filled with layers of soil you need to add the worms – place them on the top and as the soil is lose you will see them slowly disappear into the soil.

worm on top of the soil in a plastic bottle wormery made from kids

We’ve added it to our nature table and placed a black plastic bag loosely over the top so that it’s dark and have watered it mid-week using a spray bottle.

Checking on the wormery throughout the weeks the kids have observed what the worms have done – gradually the obvious layers of soil have combined and all soil is the same mix after a week. At times throughout the week they have seen worm tubes and worm casts on the surface of the soil.

See how we recorded what happened with the worms in our simple Wormery Journal a great way for children to get used to making observations.

After a week we returned the worms to the garden and have repeated the wormery time and time again.

What does the wormery show

Worms are essential for the soil, they are like mini machinery turning over the soil and breaking it up. Forming tunnels as they move they break up big sections of the soil.

Worms also “feed” on soil they ingest it and then absorb the nutrients that they need and excrete it – these form the worm casts that you can see on top of the soil, by doing this they move through the layers of the soil.

child holding a worm for a worm farm with kids

If you have soil which has a lot of worms in then it’s common to find the topsoil free of stones as the constant movement of the worms gradually moves the stones down to below the oxygen rich surface soil and makes for great growing soil. With our gardening worm at the moment we are constantly digging and I am encouraging the kids to move the worms that we find to the vegetable patch although a few of the smaller ones make their way into the pond for the frogs and newts that we have there.

Book Connection for your Wormery & Nature Table

We have included affiliate links to some of the products and resources as an associate we may earn from qualifying purchases.

We’ve been reading Underground by Denise Fleming and have decided to make a wormery to explore what worms actually do underground and learn a little more about why they need to do it.

Underground by Denise Fleming is a fantastic book for early readers and preschoolers – with those just starting to read it’s really simple for them to segment and blend the words together, for those that aren’t yet at the point we had a lot of fun with our youngest explaining what was happening in each of the images.

Featuring fantastic illustrations of animals and some plant growth under the surface of the soil the kids loved seeing what was going on in a world that isn’t easily seen.

If your child is interested in exploring the topic of what happens with plants under the soil then why not grow beans in a jar so that they can see what happens when the seed starts to grow.

A wormery is a traditional way to view what worms do underground – you can make a complex structure or like us create a simple wormery from our Junk Materials box that we can view for a week and then return the worms to the ground to continue carrying out their hard work in our garden.

Why not read some other books all about worms – check out our selection of the Best Worm Books for Kids

A simple how to make wormery from a plastic drinks bottle to help children understand what worms do. Ideal for home or classroom to explore habitats.

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Cerys Parker

Cerys is a marine biologist, environmental educator, teacher, mum, and home educator from the UK. She loves getting creative, whether it is with simple and easy crafts and ideas, activities to make learning fun, or delicious recipes that you and your kids can cook together you'll find them all shared here on Rainy Day Mum.


  1. We built our wormery yesterday, immediately after reading your email. We “watched” Underground online as we do have a copy at home, and read all about worms. Fab activity. Thank you.

    1. Fantastic. Are you going to keep a journal as well?

      1. My children are probably too little for this, so instead we check 2x or 3x a day for changes. But thanks again, it’s been such a valuable experience, even for me!

  2. This is one of the things we want to do this year! Thanks for linking up at the Hands-On Play Party! I’m featuring this post! Hope you come by today and link up again!

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