Jan, your 2011 collected Trillium kurabayashii seed have germinated! :o
You were so generous that I decided to plant some, and then kept some in the moist packed bag you sent. (Don't we all like to watch the actual germination process if we can?) Both are sitting on the kitchen counter. I guess I just never got around to putting them in the fridge.... Now every one in the bag is sending out a radicle! And hopefully, the planted seeds are, too.
From what I read, most trilliums don't germinate until after a cold treatment, and then naturally go through the next season underground, and send up a leaf in the second growing season.
Now my question for you, Dave, Wim, or anyone else who might know:how long should the seed establish its root before the next cold treatment?
If I try the "standard" 3 months warm (for root growth) and 3 months cold (in the fridge), that will take me to June 5th. Can I shorten it any? This scenario is from the start of actual germination rather than from planting, so I would think I could take at least a week off the warm period(?).
What do you all think?