Cinderella is a selection of swamp milkweed, a native perennial with domed clusters of deep rose-pink flowers in summer, held on upright stems 3 to 5 feet tall. It is a working plant: monarch caterpillars feed on the foliage while the flowers pull in bees, butterflies, and hummingbirds.

True to its species, it is built for the damp spots: heavy clay, pond edges, rain gardens, anywhere ordinary perennials sulk. Give it full sun and do not fret over drainage. It emerges late in spring, so mark its place, and leave a few stems standing over winter for the insects.