GARDENERS LIKE DIVERSITY. They especially like an assemblage of plants with something in common, large and diverse enough to be challenging in getting “them all,” but small enough to fit into a finite space – like collecting butterflies. “Come see my extensive collection of 35 different trilliums,” one might implore a fellow enthusiast. Different flowers, different leaves, varied fragrances, blooming at different times, some related, some not, with various habits, from a variety of habitats ranging all over eastern North America. Of course, such species were brought together from populations scattered across the region, but they may all be able to grow in your own back yard.