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Composting · Beginner's Guide
Your Kitchen Scraps Are Worth More Than You Think
Every bag of food waste you send to landfill is a bag of future fertiliser thrown away. Here is how to stop doing that — with nothing more than a bin, some cardboard, and a handful of worms.
Quick Answer
Vermicomposting uses live worms to break down kitchen scraps into nutrient-rich compost called vermicast. You need a ventilated bin, damp cardboard bedding, and composting worms such as Dendrobaena veneta or red wigglers. Feed them fruit and vegetable scraps, coffee grounds, and cardboard. Avoid meat, dairy, and citrus. Compost is ready in 3 to 6 months.
Why worm compost beats everything else
A traditional compost heap works. Slowly. You are looking at a year, sometimes two, before you get anything usable. Vermicomposting produces finished compost in 3 to 6 months, and the end result is richer, more biologically active, and more immediately useful to your plants.
It is also not just for people with gardens. A worm bin the size of a storage box lives happily under a kitchen sink. The only thing stopping most people is not knowing it exists.
No garden needed. A bin under the sink works perfectly.
Peat-free and organic. You control every ingredient.
Diverts food waste from landfill. Real environmental impact.
Total cost: between nothing and £35, depending on how you source your worms.
The compost you get out — vermicast, sometimes called worm castings — is not just nutrients. It is packed with beneficial microbes that improve soil structure, suppress plant disease, and make nutrients more available to plant roots. Bag-for-bag, it outperforms almost anything you can buy.
Choosing your setup
You do not need to spend £80 on a branded stacking system before you have bought a single worm. The worms do not care about the box. They care about moisture, temperature, food, and airflow. Get those four things right and they will thrive in almost anything.
1
The DIY two-bin system — free to build
Two identical plastic storage boxes, each around 30 to 60 litres. Drill a ring of holes around the upper sides of each one for ventilation. That is your entire modification. You start with Bin One — add bedding, add worms, start feeding. Once it is nearly full of finished compost after a few months, set up Bin Two beside it with fresh bedding and the top few inches of Bin One, which is where most of your worms will be. Start feeding exclusively into Bin Two. After a few weeks, what is left in Bin One is finished vermicompost ready to use. No hand-sorting required. You just move the food and wait.
2
Stacking tray systems — convenient but not essential
Purpose-built wormeries with stacking trays work on the same migration principle as the two-bin system, just in a vertical format. Worms move upward toward fresh food, and finished compost collects in the lower trays. They are tidier, easier to harvest from, and purpose-built. Worth considering once you know vermicomposting is for you. Not worth buying before you have started.
3
Flow-through beds — for serious volume
A flow-through system is a large open-bottomed bed raised off the ground. You feed from the top and harvest finished compost from the bottom by agitating a bar across the base. No migration needed, continuous harvest, high capacity. This is what commercial worm farms use. Overkill for a household, but worth knowing about if you ever want to scale up.
The leachate myth
Most beginner guides tell you to drill drainage holes and collect the liquid that runs out. Here is the honest version: a well-managed worm bin should not produce leachate at all. If liquid is pooling or dripping, the bin is too wet — add more dry cardboard, ease off wet food for a week, and it will correct itself. If your wormery has a tap, leave it open so any excess drips away freely rather than pooling at the base. Compost tea is a completely separate, deliberate process — it is not the same thing as leachate and should not be confused with it.
Bedding and worms
Bedding
Shredded cardboard is ideal — free, always available, and worms eat it as well as live in it. Newspaper works too. Coco coir is a good option if you want something more consistent. Dampen the bedding until it feels like a wrung-out sponge. Squeeze a handful — it should hold its shape but not drip. Get this right and you have already solved most beginner problems before they start.
Worms
Red wigglers (Eisenia fetida) and Dendrobaena veneta are both excellent composting worms. They thrive in the warm, food-rich conditions of a worm bin and process waste far faster than garden earthworms. Regular garden earthworms are deep-soil dwellers — they will try to escape a shallow bin and will not compost efficiently. Get the right species from the start.
Sourcing worms without paying for them
Worth trying before you spend anything. Search Facebook for UK composting, allotment, and worm farming groups — people regularly give away surplus worms from established bins. A post asking for composting worms in your area usually gets a response within a day. Alternatively, lay a sheet of damp cardboard on a rich garden bed overnight and check underneath in the morning. Composting worms are smaller, reddish, and found in the top few centimetres of organically rich soil. If you want to skip all of that and just get going, a starter pack arrives live, healthy, and ready to work.
Settling your worms in
When your worms arrive, tip them onto the surface of the damp bedding and leave the lid off for 30 minutes. Light drives them down into the bedding naturally. Do not feed them for the first 48 hours — let them settle before you start adding food.
What to feed your worms
Worms are not fussy, but they do have preferences. The list below keeps your bin active, fresh-smelling, and fast-composting. Deviate from it — especially by adding meat or dairy — and you will know about it within a few days.
Carbon is not optional
Every time you add food scraps, add dry carbon alongside it. Cardboard is the easiest because you have almost certainly got a pile of it from deliveries. Tear it into rough strips and layer it over every feeding. The carbon absorbs excess moisture, balances the nitrogen from your food scraps, and gives the worms somewhere to move through. Without it, the bin gets wet and compacted, starts to smell, and becomes the kind of thing you would rather not think about. A properly balanced bin with sufficient dry carbon will not produce leachate. It will not smell. It will just quietly work.
The one tip that actually makes a difference
Freeze your scraps before adding them. Chop vegetable peelings and fruit waste as small as you can, freeze them solid, then defrost before adding to the bin. Freezing ruptures cell walls so worms can get straight to work the moment the food thaws. It also means you can batch up a week's scraps rather than adding small amounts daily. Worms do not have teeth — they are eating the microbes breaking down the food as much as the food itself. Give those microbes a head start.
Harvesting your vermicompost
After 3 to 6 months Bin One will be filled with dark, crumbly, earthy-smelling material. That is finished vermicast. It looks nothing like the food you put in, smells nothing like it, and does remarkable things to soil.
How to harvest without losing your worms
Push all the bin contents to one side. Add fresh damp bedding and food to the empty side. Wait about a week. Your worms migrate toward the fresh food. Scoop the finished compost from the side they have vacated. Simple, no sorting required.
If you want to speed it up, the light method works well. Tip the contents onto a tray in a bright spot. Worms burrow away from light. Scrape the top layer of compost off every few minutes, working down until you have a pile of worms at the bottom. They go back into the bin with fresh bedding. The compost goes on your plants. Thirty minutes. No equipment. Done.
How to use vermicompost
- Mix into potting compost at a ratio of roughly 20 to 30 percent
- Sprinkle around the base of houseplants and water in
- Top-dress garden beds before spring planting
- Add a handful to planting holes when putting in new plants
Compost tea — a separate thing worth knowing about
Compost tea is made by soaking a handful of finished worm castings in a bucket of water for 24 hours with an air pump running to oxygenate it. Strain it and apply to plants as a liquid feed. It is a deliberate process, not a byproduct of a wet bin — and it is genuinely excellent once your bin is producing good quantities of finished castings.
Frequently Asked Questions
What worms do I need for a wormery?
Red wigglers (Eisenia fetida) or Dendrobaena veneta are the right species. They are surface-dwelling, fast-composting worms that thrive in food-rich conditions. Garden earthworms are deep-soil dwellers and will not perform well in a shallow bin. Get the right species from the start and the whole process is much easier.
How long does vermicomposting take?
Finished vermicompost is typically ready in 3 to 6 months. Warmer conditions, finely chopped scraps that have been frozen first, and not overfeeding all speed things up. Worms slow significantly below 10°C — an unheated shed in a Yorkshire winter will noticeably slow your bin down.
Can I keep a worm bin indoors?
Yes, and most people do. A well-managed bin has no smell whatsoever. Kitchen, utility room, garage, or shed all work. Keep it between 15 and 25°C, away from direct sunlight, and away from anywhere that drops below 5°C in winter.
Why does my worm bin smell?
Almost always overfeeding or too much moisture. Stop adding food for a week, add dry shredded cardboard, and mix the contents gently to introduce air. A healthy bin smells like fresh earth after rain. Sour, ammonia, or rotting smells mean you need to act quickly.
What is the liquid dripping from my worm bin?
That is leachate, and it means your bin is too wet. A healthy, well-managed worm bin should not produce it. Add more dry shredded cardboard, reduce wet food, and ease off feeding for a week. If your wormery has a tap, leave it open so any excess drips away rather than pooling at the base. Do not collect and use leachate as plant feed — it is not the same as compost tea and its quality is unpredictable.
What is compost tea and how do I make it?
Compost tea is made by steeping finished worm castings in water — not by collecting leachate. Take a handful of finished vermicompost, steep it in a bucket of water for 24 hours with an air pump running to oxygenate it, then strain and apply to plants. Worth doing once your bin is producing good quantities of finished castings.
Not ready to start your own bin yet?
You can still give your garden the benefits right now. Our hand-harvested organic vermicompost is produced on our farm in Huddersfield. Peat-free, plastic-free, and ready to use straight from the bag.
Ready to get started?
Our live composting worms are dispatched Monday to Friday in breathable packaging, with a live arrival guarantee. They arrive ready to work.
Order Composting Worms → Buy Ready-Made Vermicompost