I am in possession of a white achillea which the lovely @Linz generously sent to me last year. It has been in a pot since and has grown strong. I am now in a position where I can plant it out if I want to. The colour and the texture I think will work well. I am however slightly worried about its growth habit. Linz told me it suckered and that's why she had to get rid of it. Most websites suggest it seeds readily. Neither outcomes make it suitable for my small garden. I'm not sure what to do for the best. G.