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I'm now going to try Kristl's way with germiniating Trilliums.
While I'm at it, I should mention that intensive division is something I have practiced for years. My sense of the situation is that many gardeners are not aware of this easy method of propagation; they bring home a new plant in its pot, plant it out, and that's the end of it. I have found in many cases that on inspection, a new plant will prove to have multiple growing points and most of these will establish if divided off and planted out without delay.This is true even of some plants notorious for disliking root disturbance. Hacquetia epipactis is such a plant; by sheer chance I discovered that it pushes out new roots in mid summer (say late June or early July) and if ruthlessly divided at that time, every growing point will establish.Friends who go on nursery crawls with me are either horrified or amused to see me carefully looking over a flat of plants for the one with the most growing points. I have the last laugh; an expensive plant with 10 growing points is a ten-times better bargain than a specimen with only one growing point.Those with strong urges to tidiness may prefer to use a sharp knife to perform the surgery, but I prefer the Brazilian miracle healer technique of using my fingers. A dab of sulphur on the freshly wounded surfaces will help prevent fungal rots from getting entrance if that appears to be a risk.
i'm rather late to this thread, so rodger may or may not still be looking? in any case, i'm interested in your divisions--i presume you take some divisions for various purposes, including giving them away, but is the main objective to establish them a few inches or so away to spread the clump more quickly? or do you mainly use them in completely different spots in the garden?
Terrible confession: when I bought my present house & garden, I decided that the operating philosophy of my garden was to cause visitors to gasp not only "where on earth did you get that?" but also "and where did you get so much of it?"Once in a while I succeed.