I've been wondering if anyone is actually producing his own potting soil, as most mixes contain quite a big amount of turf which is not a renewable resource.
What do you use, if not homemade compost ?
We drink a lot of coffee in my family and I thought that coffee grounds could be ideal given their consistency especially for young plants but what about its chemical composition ?
Yes, that is definitely possible. I've seen several recipes. Most involve compost for structure and nutrients, and sand for water retention. I would be wary of overusing coffee grounds. Coffee is acidic, and also has caffeine. I don't know what that would do to young roots. Now if you were to compost those grounds for awhile with other nitrogen/carbon sources, that would be OK IMO. Good luck!