Miss wilmots ghost

Is this a biennial or perennial SBG had a wonderful one last year grew it from seed, (got 1 plant) and it took 3 years to flower, loved it, this year it hasn't appeared, just hoping to find a few seedlings, trouble is I have another( planum) planted nearby so won't know which seedlings are which,lol.

I think it is a biennial. so i must collect the seed this year.
The acathus is taking over so it will need a good chop and then I will extend the border a little more.

I agree...it is beautiful...........