The soulmate butterfly flower, also known as soulmate swamp milkweed, is popular for its sweet vanilla smell that draws butterflies and hummingbirds. But that's not the only thing that makes the asclepias soulmate special. This plant is also versatile, it is suitable for moist soil, such as next to a lake, but also tolerant of dry conditions. This sun perennial is excellent for everything from large landscape projects to naturalizing to cut-flower arrangements. Asclepias incarnata 'Soulmate'