I would say it is a good time now as Vancouveria is best divided in spring ;)
Rogaland, Norway - with cool, often rainy summers (29C max) and mild, often rainy winters (180 cm/year)!
Jan, I haven't worked with Vancouveria as much as Epimedium, but if the risk of any serious freezing temperature are over for you, then I would agree with Trond that dividing it now would most likely be successful. Sending rhizomes that are ready to emerge would be easier than sending them later with fresh easily-damaged sprouts to worry about.
6 F here this morning, and only 13 F at near midday even though sunny, and with an snow/icepack layer still 18" deep, I'm afraid I will not see any Epimediums or Vancouverias for quite some time.
Massachusetts, USA, near the New Hampshire border USDA Zone 5
antennaria at aol.com
Some multimedia imagery on Vancouveria chrysantha!
Photo of Vancouveria chrysantha:http://www.flickr.com/photos/papaquijote/94575538/...with seed pods:http://calphotos.berkeley.edu/cgi/img_query?enlarge=0000+0000+0608+2034
Pollination:Vancouveria chrysantha pollination by Bombus mixtus
Solitary bee visits Golden Inside-out flower
Seed dispersal:Ants disperse seeds of Golden inside-out flower, Vancouveria chrysantha (the ants are attracted to the elaiosome portion of the seed; the seed does look very much like Epimedium seed, like a tiny lima bean)
Ant disperse seeds of Vancouveria chrysantha
A ray of sunshine today, a hairy coiled shoot on Vancouveria chrysantha.
Vancouveria chrysantha turned yellow early in summer 2011 and dropped all leaves, I worried that something happened. Here in spring 2012, no sign of it, I think it gave up the ghost, in other words, it died.
I went down to my large patch of Vancouveria hexandra that has been in my dry unwatered woodland area for over two decades, dug out a piece to plant one closer to my cultivated garden area in proximity to Epimediums, but when I saw the very long rhizomes I had second thoughts. I did indeed plant it, but in a spot that it will be free to run. It should be noted that some Epimediums are equally spreading and sending out foot-long rhizomes annually, and such types must be planted carefully, versus the much better behaved clumping types.
Nice informative pics, Mark. I haven't even noticed mine pop up yet! Even the Hacquetia epipactis right next to it seems to do better (!) ???
Rick Rodich zone 4a. Annual precipitation ~24 inches
near Minneapolis, Minnesota, USA
My Vancouveria chrsantha got little after the winter:-( So i decided to divide it. Just three divided plants left! Maybe this could help anyone.