After spending the last few Fab Foliage Fridays in the luminous company of assorted silver- and gold-leaved splendors, I'm heading over to the dark side. I've always loved deep, mysterious garnet and burgundy hued plants for their sense of mystery, the feeling of impenetrable depth they add to a planting, and for the easy way they have of associating with hot colors or, for that matter, any color at all. One of my top picks in this part of the palette is tropical smoke bush (Euphorbia cotinifolia). It's among the darker brethren of this leafy fraternity, and is especially beauteous when sunlight shines through the leaves--they almost glow, like molten lava. And then, there's the way raindrops bead up on the leaves, like jewels. It's a tender tropical plant, but easy to overwinter dormant--I've seen it growing in the tropics and even there it loses all its leaves during the "winter"--I just put mine down in the basement.