Persicaria amplexicaulis is a species that hails from the Himalayas but readily available as a garden plant in the form of cultivars with names like 'Firetail' and 'Firedance'. It's a tough, shrubby plant- totally reliable year after year. 

 

 P. amplexicaulis is visited by a variety of pollinators. Particularly wasps if my garden is anything to go by. Wasps feed on sugars -hence their attraction to picnics- but by foraging for nectar on flowers they spread pollen. The importance of wasps as pollinators seems to have been rather overlooked till recently.