Tag: Compost

3-bin Garden Compost

3-bin compost making

We’re trimming hedges and taking up the broad beans this morning, so our new compost bins are proving useful. To create more room for the glut of material at this time of year, I’ve been moving the progressively more broken down compost from one bin to another. Bin 3 is almost ready to use. Some of it was wet and claggy but forking it across from bin 2 gave me the chance to break up the clumps and let the air get to it.

In case of downpours, I’ve covered bins 2 and 3 with opened-out compost bags, held down with a few bricks. There’s still plenty of opportunity for the air to get to the compost because there are one-inch gaps between the slats.

I was pleased to see one or two small red earthworms as I lifted the plastic sheets. Often referred to as brandling worms, they’re part of the recycling system in compost-making.

3-Bay Compost Bin

compost bin plan
drawing board

I need to work out exactly how much timber I’ll need for my 3-bay compost bins and I’m struggling to do a back-of-an-envelope type sketch with ruler and pencil in my sketchbook. So why am I struggling? – I’ve got a drawing board with parallel motion and drafting head stowed away in the corner at the other end of my studio. I’ve enjoyed the excuse to get it out again to draw an orthographic plan and elevations.

My old compost bin was made from recycled timber from next door’s summer house (which itself had been recycled from a previous existence as a lean-to conservatory) but after ten or fifteen years that was ready for replacement and this time I’m going to use FSC-certified decking boards with 3×2 inch uprights.

Turning the Heap

compost bin
We won’t be going for lids on the bins this time, an offcut of carpet will have suffice to stop the compost getting waterlogged in the rain.
Previous twin bins: the lids proved awkward.

I’m keen to have a better arrangement for the front panels, so that will be slats which will drop into grooves. The idea of having three smaller bins in place of the larger twin bins I had before, is that it should be easier to get a system going of turning the heap. The garden waste will start off on the left in bin number one, then I’ll fork it over into bin number two in the middle ending up with one final turning into number three on the right. Composting is an aerobic process, so that will be two opportunities to let the air get to the compost and also to mix soft green waste, which on its own can become claggy and anaerobic, with dry fibrous brown waste.

Be kind to your Shredder

Kingcups by the pond.
Kingcups by the pond.

knot of hawthorn twigI’m realising that, tough as it is, I’ve got to start being considerate to my garden shredder. In addition to the usual hedge clippings, I’ve also got grasses, docks and chicory that I’ve cut from my meadow area. I’m tempted to overload it by pushing as much in as I can but this just jams it. The best way, I’ve discovered, is to put the material through loosely in small quantities rather than in compacted wodges. As I don’t now get any jamming, this is actually quicker than cramming it in.

knot of woodThe one thing that will stop it with hedge trimmings is a knot of wood. This fragment of hawthorn twig had probably been bouncing around for a while inside the shredder but after I’d stopped it to empty the trug, it got firmly jammed between the blade and the housing when I turned on the machine on again.

The freshly shredded green hawthorn hedge trimmings make perfect composting material. After a day or two, when I felt just below the surface, the heap was throwing off heat and there were white ashy flakes on the edges of the leaf fragments.

Compost Bin

The main component in this compost bin isn’t the timber or the nails; it’s the sheer intellectual effort involved!

Working with recycled timber means that you’re improvising all the time, planning which piece to use where. The only materials we bought at the local builders’ yard were two packets of galvanised nails and one sheet of outdoor plywood for the lids and one of the ‘doors’.

So is  it really worth all this effort for a compost bin?! Of course! The compost bin is at the heart of the garden, turning plant waste into valuable humus (another bonus is that at last we’ve whittled down the stack of timber that I salvaged ‘because it would be useful’ but which has been leaning against the shed for several years!)

This double bin holds 2.5 cubic yards of compost (almost 2 cubic metres) which would weigh about 1 ton (or somewhere in the region of 1000 kilograms) depending on how wet or dry it was. Imagine bringing that lot home from the garden centre! And, for that matter, think of the cost of transport if we sent our garden waste away with the local authority collection. We told them we didn’t require a bin when the scheme started but we did take them up on an offer for a recycled plastic compost bin which sits in another corner of the garden, by the shed.

I had to manhandle my mum’s compost wheelie bin down her driveway this morning so I’m well aware how heavy bulky organic matter can be.

What I don’t like about this design of compost bin:

  • it’s so large now that it shades one end of the greenhouse
  • with the lid on, the birds can’t get at it – although I’m sure the Toads will find their way to it

Covering the compost and insulating it from the weather helps speed up the composting process. This bin is double-walled with cardboard cartons acting as insulation in the cavity. When the cardboard starts to rot down, that can go into the compost too (if I can find a way of lifting it out of the narrow cavity, that is).

produceIt’s unfortunate that the compost will be out of bounds to birds in future but at least the Robin got a chance to hop around the disturbed ground as we worked today, almost under our feet.

We’re going to have some amazing crops of vegetables from the compost this bin will produce!