Compost bin? Wormery? who knows?

IMG_4254I’m not sure what to call this beast any more. It doesn’t seem to obey any of the rules that  I thought we’ve been following for years, but goes on it its own sweet way consuming everything we put into it.  It’s supposed to be a compost heap, and at the beginning that’s how we treated it. A compost heap is an exercise in managing cycles – loading, turning and eventually extracting the finished compost, and that’s how ours has always worked in the past.  But this one seems to be different.  We began it back in the summer when we relocated it from some neighbouring unused ground.  We didn’t really pay too much attention to it apart from makng sure that it was kept moist through the dry summer. We compost all of our suitable household waste  (probably 5Kg a week) – peelings, eggshells, cardboard, tea leaves (not bags) plus anything that comes off the allotment. It’s not huge, it’s 1m diameter by about 1.5m tall which is just over 1 cubic metre – about the maximum size we can manage.  Any bigger and it’s difficult to remove the wire frame to get to the compost.  It couldn’t be simpler to make, you just make two cirular cages with sheep wire, one about 25 cm larger than the other and line the gap with heavy cardboard.  The boxes bicycles are delivered in are easy to scavenge in town. Then you fill the wire and cardboard tube with whatever comes along.

In the summer we started to feed the heap with urine diluted 10:1 with water and it heated up considerably, not to the 60C claimed by some systems but above 40C which, at 10C above ambient even in the hottest weather, showed that something microbial was happening. While this was happening I noticed that very large numbers of brandling worms were moving to the top, presumably to avoid the heat. We’d never added any worms to the heap, they just seemed to find their own way there. As autumn came on they moved down again and I expected that the heap would slow down and not do much until the spring.  I was mindful of the fact that it was now very full and would need turning as soon as I could build a second container. But whatever process is going on seems not to have diminished at all, and each time we top the heap up, within days it’s reduced once again, and I’m beginning to wonder whether the primary process is driven now by worms.  So has it turned from being a compost heap to a wormery?  I’m really concerned about disturbing it while it’s working so efficiently so I think I’m going to leave it alone over the winter, maybe wrap it up a bit with some insulation and see what happens. I’ll just build a second compost heap alongside it.

If it has turned itself into a wormery, then extracting the compost is going to be a bit more difficult because the cages don’t permit the easy removal of material from the bottom, and so I might just build a proper worm bin with a means of extraction and then try to move the original contents, complete with worms, across to it.  I don’t know exactly what the weight would be but 1 cubic metre could be 500-600Kg depending on the moisture content.  I’d always thought that I’d need to buy worms to start the process, but as always nature needs very little help in doing what it always does. I guess I’ve created an ideal environment for brandling worms to breed in and they’ve just done their thing. I’m delighted, hopeful, grateful and I feel properly put in my place once again.


The timber has arrived for the new batch of raised beds and so the next couple of weeks are going to be devoted to civil engineering. There are a lot of outstanding jobs to be done, not least plumbing together the four water butts because the mains water supply has now been turned off and we need to get all 1000 litres of rainwater gathered over the winter. I also now need to get a wormery constructed and finally I want to do some experiments with a moveable hot-bed next season. Our second LED propagator light has now arrived so soon it will be time to sow chillies ready for an early start. Yesterday we removed all the window boxes to the greenhouse to protect the geraniums from the frost, and we’ve replaced them with another six boxes planted with spring bulbs.  For a while it looked very bare through the windows, but there’s something hopeful about seeing the green spears poking through the soil. It all sounds easy but everything has to be lugged up and down three flights of stairs and across the sloping allotment site and my knees are complaining.