I was just searching the Web for information on the interspecies geranium 'Calliope' which I totally love. I ran across a blog from Abrahamson's Nurseries, which I found really interesting. It has a number of nuggets of good info & an interesting insight into their greenhouse operation...well worth the read, IMHO.
They have nurseries in 3 areas:
Scandia, MN....Stillwater, MN....St. Croix Falls, WI
If I lived near one of those areas, I'd sure want to visit one of them. I haven't read the entire web site, but I don't think they do mail order.
USDA Zone 8b
Heat Zone 3
Sunset Zone 5
SeaTac, WA...one cool place