I always thought I would have a trough full of Physoplexis comosa, and there would be seedlings forever, but after last winter, there is nothing. (I don't know what happened.)
A trough full? Wow! Better to have loved and lost than never to have managed to grow those cuties!
Calgary, Alberta, Canada - Zone 3
-30 C to +30 C (rarely!); elevation ~1130m; annual precipitation ~40 cm
The plants were there for twenty years, blooming and reseeding. But I lost a number of plants last winter that had been here for a quarter century.
extreme western edge of Denver, Colorado; elevation 1705.6 meters, average annual precipitation 30cm; refuses to look at thermometer if it threatens to go below -17C
I get the impression that in the U.K. one can simply pop round to the nearest alpine nursery and pick up several of each species. Or possibly request some seed from one of the growers at a show. (I try to avoid looking at the show pages in the AGS and SRGC bulletins so as not to be jealous.)
Alpine nurseries few and far between in this part of the UK Bob. I've just had a quick search of the SRGC Forum and apart from Lamium armenum which figures in a few Show pictures, and L. orvala which has a few growers (Tim Ingram for one ) there isn't a lot of information. Jozef Lemmens in Belgium has grown L armenum var. sintenisii. From the RHS Plantfinder only Aberconwy Nursery (the finest alpine nursery in the UK to my mind) in Wales is shown as growing L armenum.
in Devon, UK Zone 9b
Judging from the superbly-grown plants featured in the show section of the AGS bulletin (which I read cover to cover), the U.K. has alpine nurseries on every street corner........
That's what I would have imagined too!
I think you you wouldn't need many more were you to count the specialist alpine nurseries in England on toes and fingers!