New to me in 2013 from a newly discovered garden centre this fascinating, colourful plant is a 'weed' in the USA and southern America but adds great yellows and reds to my hot bed in late summer. It is beloved of butterflies and bees and each seed has its own silky parachute, which I have yet to witness. Apparently this one won't be hardy here but its partner, Asclepias tuberosa (orange), which I have also bought, will be. They are said to be drought tolerant and love sun so what could be better? Interestingly the butterflies haven't found them yet, but the bees have. The Buddleja and Verbena bonariensis are still the main butterfly targets.