Asclepias is another group of plants I have a major thing for. None except A.incarnata and perhaps the more tender A.tuberosa and curassavica are at all well known in the UK but all have a certain something about them. Certainly they don't look like anything else in the garden.
A.exaltata is to my mind one of the best new things I've come across, and I have no idea why I so rarely sell any
Although the flowers are not vividly showy they are exquisitely crafted in jade and ivory and dangle elegantly on long filaments from the tips of the 2ft stems.
Very much a part of the prairie/woodland edge communities in the eastern US - these are completely frost hardy and easy to please on any fertile retentive soil in sun or part shade.
3L pots ~ £9