Hi Leisha, the links you have there are all for garden lime (Calcium Carbonate, CaCO3) which is no longer neccessary to add to the growing mix. In recent experiments we’ve found that adding agricultural lime (as mentioend in module 3 at present) to the coffee/straw mix is uneccessary, and that you can have perfectly good results without it. We are due to update the course information in the weeks ahead, and the recipe we will recommend to people will simply be:
for every 1kg of fresh coffee grounds, add:
150g pasteurised straw (either lime bath or hot water pasteurised)
150g oyster mushroom spawn
The lime needed for the lime bath pasteurisation is Hydrated Lime – which is sometimes also called Builders Lime. It usually has less than 10% magnesium content (which is good), but worth checking this with the supplier if possible.
Hope this helps a bit – all the different types of Lime out there does make it pretty confusing!
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