Rosemary is just down the road from us a mile or two. If you're out this way their garden is well worth a visit especially the large subtropical house and passionfruit collection. I have obtained roots of Iris wattii and a number of other crested iris over several years - they're all out right now.
Terry Murfreesboro, TN (Zone 7a) (122 reviews) January 2, 2002
This was the only retail source I could find for Centranthus macrosiphon seed (an annual form of Centranthus), and they have a good list of other unusual, hard-to-find seeds. (So of course I just had to pick up a few others while I was ordering!)
It's a small operation, so it took a few days to receive a reply to my initial email. Rosemary was very helpful and my order arrived promptly, it was well-packaged and even contained a hand-written note from her. A good experience all around.