How to Start a DIY Worm Farm (for free!)

How to Start a DIY Worm Farm (for free!)

If you want to turn food scraps into rich, organic fertiliser — without spending a cent — a DIY worm farm is one of the best ways to do it. Worm farms are simple, low-maintenance, and perfect for small spaces. You can even make your own setup from things you already have at home.

Here’s how to get started — and keep your worms happy, healthy, and hard at work.


What Is a Worm Farm?

A worm farm (also called a vermicompost system) is a container setup where composting worms break down food waste into two powerful natural fertilisers:

  • Worm castings — the dark, crumbly “worm poo” full of nutrients and microbes.
  • Worm juice (liquid fertiliser) — a concentrated liquid that drains to the bottom and can be diluted to feed plants.

Creating a worm farm is one of the easiest and most sustainable ways to recycle food scraps — even if you live in an apartment.


What You’ll Need to Start a Worm Farm at Home or School

You don’t need a fancy commercial worm farm — just a few basics:

  • A container: Anything from an old foam box or plastic storage tub to stacked buckets or pots.
  • Composting worms: The best types are red wigglers (Eisenia fetida) or tiger worms (Eisenia andrei). You can buy them from a nursery or get a handful from a friend’s worm farm and they’ll reproduce naturally..
  • Bedding material: Damp shredded newspaper, cardboard, coconut coir, or leaf litter — this keeps things soft and moist.
  • A cover: An old towel, hessian sack, or cardboard sheet to keep the surface damp and dark.


Step-by-Step: How to Make a DIY Worm Farm

Option 1: The Three-Bucket System Worm Farm

This is one of the easiest and most popular DIY designs.

  1. Grab three plastic buckets or pots — that will sit inside each other. The bottom layer will need to be a bucket without holes, or alternatively buried straight into your veggie garden. You can save the third layer for later, when your worms have eaten through their food in the existing bucket and are ready for a re-fill.
  2. Drill drainage holes in the bottom of the top two buckets (about 6–8 holes).
  3. Add bedding (damp shreds of newspaper or coco coir) to the top bucket.
  4. Add food scraps from the list below.
  5. Add worms
  6. Cover with damp cardboard or hessian, then pop a lid on loosely so there’s airflow. Drilling holes into a lid is another option.
  7. Once the worms have eaten through most of the food in the bucket, add another layer and repeat the process. The worms will make their way up into the top layer in search of more food, leaving the lower layer full of powerful nutrients ready for the garden - worm castings. 
  8. The liquid fertiliser (worm tea) will drain into the bottom bucket — just dilute it about 1 part worm juice to 10 parts water before using on your plants.

Option 2: The Styrofoam Box Worm Farm

  1. Use three foam boxes — one for the worms, one underneath to catch liquid, and one for an extra layer once your worms have eaten through the food in the first box. 
  2. Poke small holes in the bottom of the top two boxes for drainage.
  3. Repeat steps 3 to 7 from option 1.

Foam boxes are excellent because they keep worms insulated — ideal for Melbourne’s chilly winters and hot summers.


Option 3: Repurposed Storage Tub or Crate Worm Farm

If you’ve got an old tub or crate lying around:

  1. Drill drainage holes in the base and a few air holes around the top.
  2. Place it over a tray, old roasting pan, or another tub to catch any liquid.
  3. Fill with bedding and worms as outlined above and cover lightly.

 

Tip: Worms need moisture and oxygen — never let the farm dry out or become waterlogged.


Feeding Your Worms

Worms aren’t fussy, but balance is key.

Do feed them:

  • Fruit and veggie scraps
  • Tea leaves and coffee grounds (in moderation)
  • Shredded paper, cardboard and fallen leaves
  • Crushed eggshells

Don't feed them:

  • Meat, dairy, or oily food
  • Onions and citrus (too acidic)
  • Large quantities of bread or grains

Start small — just a handful of food a day until your worm population grows.


Keeping Worms Happy

  • Temperature: Worms love it between 15°C and 25°C. In Summer, keep your worm farm shaded; in Winter, move it somewhere warmer.
  • Moisture: Keep bedding as damp as a wrung-out sponge. Add a sprinkle of water if it feels dry.
  • Airflow: Stir the bedding occasionally to keep it aerated.

If it ever smells bad, it’s too wet or overfed — add more dry material and stop feeding for a few days.


Using Worm Castings and Worm Juice in the Garden

  • Worm castings: Mix them into your garden soil or potting mix to add nutrients and beneficial microbes.
  • Worm juice: Dilute 1:10 with water and use it as a liquid fertiliser on seedlings, veggies, and houseplants.


Why Every Gardener Should Start a Homemade Worm Farm

A worm farm is one of the easiest, cheapest, and most sustainable ways to garden. It:
* Reduces food waste
* Creates free fertiliser
* Improves soil health naturally
* Teaches kids about recycling and soil life
* Works in any space — backyard, balcony, or classroom

You don’t need to spend anything — just reuse what you already have and let the worms do the work!

 

Final Thoughts

Starting a worm farm is simple, satisfying, and seriously good for the planet. Once your worms settle in, they’ll quietly transform your kitchen scraps into garden gold — 24 hours a day, no power required.

So before you throw those veggie peels away, start a DIY worm farm and let nature do the recycling for you.

Back to blog