Does anyone have any old/new Dierama books?
Please get in touch to arrange swap/trade/whatever it takes.
The only book I know of on the subject is: Dierama; The Hairbells of Africa by OM Hilliard and BL Burtt. It's not readily available. If you find someone willing to swap, grab it!
Here is a link that might be useful: Rainbow Gardens Bookshop
Try this website:
Hope it will help!
I purchassed "The Harebells of South Africa" in RHS Wisley bookshop two years ago. You can contact them through the RHS website and enquire if it is still available.