DIY Worm Composting

Something that irks about not having our own garden space is not being able to make our own compost. At our last place we donated our food scraps to others’ heaps, which worked out just fine. We thought we’d got a similar arrangement going here but our new neighbour turns out to be a bit fussy about what goes in her heap, accosting me one morning with a list of things that she didn’t want in there, all of which we happily chucked in our compost bins in the past without any issues. From the outset we had a feeling that would happen. You know how some people can be and as lovely as she is it was fairly inevitable that she’d go picking over the compost and find a problem. C’est la vie, as our compatriates like to say.

So what to do with our growing mountain of food waste? We contemplated a regular compost bin but they seem to retail at around 30€ here. These bins make compost slowly – not always helpful in a rented and (hopefully) fairly temporary house  – as well as requiring quite a lot of work and taking up a lot of space – time and space we don’t have. A compost tumbler then? They retail upwards of 80€, so a no go. That’s a lot of bags of compost and the 80€ ones didn’t look great and there was no question of us spending more than that. DIY? We thought that was the best option and even bought a barrel to use but the cost of all the small parts to make the door, the catch, etc came in at nearly 40€ – crazy! Another option bites the dust. That left us with one option: worms!

It turns out that composting with worms is actually the best way to turn your old food scraps into garden fertiliser and soil conditioner. In fact, if you are regularly chucking your food scraps into a plastic bin and letting it turn into compost, you are effectively composting with worms because the worms that turn up in compost bins – tiger worms – are the same worms used in most worm composting systems.  In the UK our old composter seemed to just get on with it: we’d chuck our food waste in and later in the year it would be gone. We barely got any usable compost out of it but at least it wasn’t in land fill. I presume the worms were eating it!

Contrast that with my repeated failed attempts at worm composting. I had a Can-O-Worms and after three failed attempts gave up and gave it away. With this in mind I was reluctant to spend any money on a proper wormery so we went DIY. There are a lot of good wormery suggestions out there and they’re all pretty simple. We wasted an evening trying to find the things we needed online (a plastic box for under 10€ -how hard can it be!?) then found everything we needed at Mr. Bricolage for 41€, which included 10€ on a fancy drill bit. Here’s the shopping list:

  • 2 x black plastic containers. We went for the 48 litre ones which are wider and flatter than the 50 litre versions.
  • Something for the lid. Our containers didn’t come with lids so we bought some chip board, enough to make two lids, if we decided to set up an other container.
  • Mesh to cover the base and the ventilation holes. This just stops flies getting in and worms getting out.
  • A tap. This is for the bottom container so that we could drain off the liquid, which is a fantastic plant feed known as “black gold”!

We also had to buy a special drill bit so we could fit the tap.

Here’s the result.

 A picture of a worm bin made of two black plastic containers with a wooden lid and a plastic tap

Worm bin with tap

A picture of a piece of chipboard with 8 drilled holes covered in mesh

The lid: 22mm holes covered in fine mesh to stop the flies getting in

A blonde girl leans into the open container that contains a layer of compost, the tiger worms, and some food waste

DD checks out the finished product, complete with worms and food waste

It’s a really nice and simple design. The bottom box is used as a reservoir to collect the liquid. The tap just simplifies removing it and isn’t absolutely necessary – a hole in the bottom draining into a cup or jam jar would work just as well. The second box is the worms’ home. We drilled drainage holes in the bottom then lined it with mesh so that our little wormies don’t fall into the bottom box and drown (that happened a lot with my Can-O-Worms wormery – a tragic as well as stinky thing.) For the lid we drilled more holes and covered them with mesh held down with wood glue. And that’s it. All that was needed then were worms.

We asked around, posted in a couple of Facebook groups, but ended up buying some from a local fishing shop – another 20€ but we now have a ready-to-go wormery that cost, in all, around 50€ with enough parts left over to make another. We’d need a couple more plastic containers but can transfer worms from this one so the extra cost will be just 12€.

For the worms to be happy in their new home they need not just food but also bedding. For this we covered the base of the top bin with a layer of wet paper then put a layer of compost down. The veg scraps then went on top. Internet wisdom generally suggests letting it all get going before piling too much in there so we sprinkled some of the fresher looking scraps on there, gave it a spray with some water to ensure it’s not too dry, closed the lid and left them to get on with it.

We did have a bit of shock the next day when it looked like all the worms were trying to escape as they’d congregated at the top of the bin but some Googling later and we’re putting that down to typical worm behaviour, either because they’re in a new home or because it rained through the night. They seem to have settled down again today (Day 3) so perhaps it’s all working just fine. We will see!

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