Posted: 01/09/2014 at 09:17
Mine has to be Lythrum Blush which I bought as a 9cm pot in April. It's been flowering for two months now and I think will be a nice big plant next year.
Worst has got to be Anthemis EC Buxton, planted in Oct which flowered and promptly died. I wonder if the surrounding yarrows requisitioned its water supply.