Persicaria bistorta (also Bistorta officinalis)
Plants bloom late spring into mid summer, producing tall stems ending in single terminal racemes that are club-like spikes of pink-rose colored flowers. The racemes are about 2 cm thick and 5–9 cm long and end 1 meter tall,upright growing stems. Plants grow in moist soils and under dry conditions go dormant, losing their foliage until adequate moisture exists again. This species is grown as an ornamental garden plant, especially the form 'Superba' which has larger, more showy flowers.
Is a herbaceous flowering plant found throughout Europe. In Belgium I have seen it in the wild although this pics are made in the botanical garden.
National Botanical garden of Belgium.