What's a Newcastelia? I've never heard of it.

Lambs Tails. Chloanthaceae. Knee-high shrubs. There are a number of species, with pretty little purple flowers in preposterous white woolly calyces. They look as if the flowers are set into little cotton balls. They come from arid and semi-arid country, and are such an obviously desirable garden plant, yet I never see them for sale, so I suspect there is a catch somewhere - like they're difficult to grow?
I haven't looked for photos on the internet, but suspect they'd be there, funnelweb.
Trish

I'd be guessing they are very easy to rot. That's been my experience with mairiana, ptilotus, pityrhodia and fuzzy leaved eremophilas.

I suspect lambs tails are the type of plant we'd love to have (away from the west) but reality dictates otherwise?