I bought a pair of rhizomes last winter, and both grew during the summer to about 1m but showed no inclination to flower. I realise they probably need some time to get established.
Checking the web, it looks like the species name should end in 'eum'. Apart from that I can find no information.
Have any of you had any experience with this plant?
How long does it need to settle in?
Are there any special conditions/tricks they like/need?
They are planted in a bed that gets full sun from about midday, but with a cool root run, as they are growing through a bed of Erigeron karvinskianus (Seaside daisy).
I am in Western Sydney, NSW