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The Young mix has no soil in it. Shredded leaves can be used for the mix after only a few months.Potting mix is two parts gravel, two parts sand and one part leaf mould.(Previously we used two parts loam in stead of the sand but we ran out of loam!)See the recipe here: http://www.srgc.org.uk/bulblog/log2007/260607/log.html
Thanks Maggie - will keep that recipe and give it a go
I have only just spotted the illustrated link to Ians bulb log. That is a very gritty mix - it looks as if I was adding nowhere near enough grit to my potted mix.
I imagine the amount of grit you need depends a good deal on the amount of rainfall you get. Cambridgeshire, where I live, is very dry and I'm sure there is much more danger of pots getting too dry in summer than getting too wet. Just because Ian's recipe works for him where he lives doesn't necessarily mean it will work for someone else in another location. But you could use Ian's recipe as a good starting-point for experimentation.