Thanks, Susie.
Am very fond of culver's root (Veronicastrum); also "a rising perennial garden"(?), viz. the garden gets steadily higher through the growing season.
Up to perhaps ten years ago, you'd see culver's root for sale here every spring, but the grower (Epic) went (largely?) out of business.
For several years, there was lots of 'Fascination' (love it) and towards the end of easy availability, 'Lavendelturm' (very pretty).
Culver's root is a big favourite of the bees.
Was told they like tall flower spikes.
Entirely agree with you Lucy, that 'Peppermint Twist' is a great cultivar.
Even like the quite frequent (at least with ours) branch mutations apparently back to parent 'Candy Floss'.
It's proving to be a very vigorous garden phlox; with our few plants, it's more vigorous than our one 'Candy Floss'.