Hedychium greenei and Cautleya spicata: starting from rhizomes
Hi. I've just ordered some rhizomes of Hedychium greenei and Cautleya spicata and am wondering how best to start them into growth. I'll be starting them off in pots of compost. Can anybody give me any tips on growing either of them, e.g. how deep to plant them, how moist to keep the soil, what temperature, etc.?
As to where to put the pots, I have an unheated greenhouse but assume that will be too cold for them to start growing for some months yet (here in London UK we are vaguely equivalent to Zone 8-9a, though obviously without the decent summers/intensity of light). So I'll be keeping them indoors by a bright windowsill - does this sound okay?
I'd be very grateful for any advice on growing these.