Mine are much paler than other photos show - a soft pink. I did buy this as Persicaria amplexicaulis 'Firetail', however. Persicaria has since changed to Bistorta, but the cultivar should be the same. Not sure why mine is so pale, as it is at Deb's house. Could be a mismarked 'Pink Elephant' or 'Rosea'.
2019: I had to thin these out in the front garden so the sprinkler could get past them. I moved a bunch to the front bank next to the Bishop's Weed.