John Edgar wrote:

Does anyone know what Garotta is? Is it a chemical or is it "natural"
in any sense? Would it do in my new "Green Cone" digester?

It is a bit of both. Freeze dried compost fungi and ammonium salts.

It works pretty well to start a new heap into hot composting early in
the season. You can cut it with much cheaper inorganic ammonium
sulphate. Helps small heaps rot down faster - irrelevant for big heaps.

It is a pretty good way to start a new compost heap along the right track.

Regards,
Martin Brown