A kalanchoe or two—or three or four or five—should find its way into your collection. One, velvet leaf, will slowly grow to twenty feet, but most of the others stay compact enough to grow on a warm windowsill all Winter, and a sunny spot in the garden all Summer. Paddle plant is the second in my collection.
Pairs of blue leaves the size and thickness of pancakes ascend thick stems; if the plant never did anything else, its talent as living sculpture would still be unsurpassable. But there's more.