humus rich, lots of leaf mould etc. I dont think they are too fussy about the acid/alkalinity of the soil. Well I hope not as I have bought several for a slightly alkaline soil.
welcome to GoY too :o)

And a fair bit of dappled shade, they're woodlanders, and little beauties at that. Phil J

They prefer neutral to slightly acidic soil so you may need to use ericaceous compost around yours SBG.