The books, and most experts, will recommend you wait until around fall, but sometimes trilliums and other ephemerals aren’t so easy to find by then as they are in spring, in their flowering glory (above). This little “aha” was imparted to me and Ken Druse by Evelyn Adams of Wellesley, Massachusetts, when we visited her garden awash in trilliums one spring, working on Ken’s 1994 book “The Natural Habitat Garden.”“How did you get so many?” Ken asked the elderly Adams, and it was simple, she said: She dug them up and separated them when they were in flower—you know, when you can see just where they all are, since none have gone dormant.The instruction made such an impression that Ken and I have both been doing it this way—not waiting till late summer or fall—for years. (Wild plants must never be dug for this or any purpose. Commercially, trillium are ethically propagated by seed.) Since their rhizomes a