That J. dubia has certainly outdone itself this season, Lori. As I recall, you were always hopeful that it would one day "break out".
Update on the J. diphylla seedlings.. Pic from May 1.
Rick Rodich zone 4a. Annual precipitation ~24 inches
near Minneapolis, Minnesota, USA
They took off in 2012, with enough flower density to make an impressive sight. Terrific plant! I'm pleased that the seedlings I moved around last year have come up, too.
But that reminds me, I had J. diphylla somewhere... must go check on it tomorrow. Very well done with the seedlings!
Calgary, Alberta, Canada - Zone 3
-30 C to +30 C (rarely!); elevation ~1130m; annual precipitation ~40 cm
How did you germinate these?
Oscillating cold/warm cycles?
I have them out in an unheated garage?
When someone sent me fresh seed in late June, I immediately scratched them into the soil, about 3mm deep.
They sprouted in early May.
Caroline, look here:
It's really easy to set up a free account, and read the papers for free, just click the "Read on line" button, and go from there.
Thanks for the link Rick! I signed up, the free version allows adding up to 3 articles ( for reading only) to one's "bookshelf" for 2 weeks, after which they can be removed and new articles added . One can make screen captures of each page of an article as a workaround, for future reference.
The curious thing about the Jeffersonia germination article, a couple times they say there are 4 species (!) but only mention diphylla & dubia; there are a few published names of other Jeffersonia species but considered by The Plant List as synonyms or having "unresolved status". One thing learned from the article, is that 3 summer months of warm stratification is needed for the embryo to plump up by autumn, for successful germination the following spring, confirming the need for immediate sowing when seed is ripe.
Massachusetts, USA, near the New Hampshire border USDA Zone 5
antennaria at aol.com