I decided to adapt the information kindly posted by Anne Gibson and Lissa to making my own flavour of container potting mix after a string of failures with asian greens that were previously so reliably productive in containers.
Here's what I did.
First I compress a very generous layer of freshly mowed lawn clippings to the bottom of the container. Grass being grass, it compacts over time. Being the bottom layer I wanted to minimise nitrogen escaping into the atmosphere. It also means bad odours, if any, from anaerobic decay are suppressed (although to date I haven't noticed any foul smells even after the recent heavy downpours) and the layer seems to retain moisture well. Weeds haven't been a problem apart from the odd volunteer or two.
Over this, I add a layer of mushroom compost.
This is very fresh mushroom compost from the Mushroom Exchange at North Maclean. It was still steaming when we bought it on the weekend. Hopefully it's ok to plant in.
The final layer is recycled potting mix (in this case Brunnings el cheapo with some Searles Premium) with added minerals (in this particular case crusher dust), fertiliser (bone and blood here but whatever I have on hand at the time will suffice) and maybe dolomite if the pH meter tells me so. This top layer is blended in with the mushroom compost.
All done! Now the verdict, for me, is still out on crusher dust. It looks suspiciously like crushed cement to me, I'm not sure if it'll do anything for the plants.
And it wouldn't be right if I didn't say: And here's one I prepared some weeks ago for some strawberry runners.
The strawberries seem to be doing well. They've gotten quite big and I'm always having to remove their own runners. As I compressed the grass, there hasn't been much reduction in the depth of the planting medium.
I figured this might be another way to recycle lawn clippings. I see my neighbours bag them by the kerb which seems like a waste of nitrogen to me. Then they buy bags of fertiliser from Bunnings. It boggles the mind!
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