Do you think it might be a slightly unhappy achillea, or perhaps a species plant? It doesn't seem to have a lot of flowers per head compared to the varieties I have in the garden.
Talking of achilleas, I was recommended Inca Gold above Moonshine by a nurseryman who's won Gold at Chelsea (Harvey's Garden Plants, just north of Bury St Edmunds, delicious teas and sweet hens). He says its a much better plant, alhtough not well known.
re. Plant knowledge - going round good nurseries very slowly looking at the plants and their labels, and going round good gardens very slowly, I think. I'm good on plants (it's probably actually one of my major talents), and I think it must be because when I was young, Easter bank holiday would have consisted of walking very slowly with my grandparents, aunt and uncle round a garden, with people saying 'there's a so and so'.
Now, query of the day - how would Beth Chatto (or the late great CL) plant a paeony like this one - www.dejager.co.uk/product/?pid=17308? It needs to move from the back of a border to somewhere you can see it?
If we were to go to Great Dixter, when's the best time of year to go?