This grower is sure of this plant identification.
Betony, Wood betony, Bishop's wort
Stachys officinalis (Betony). This species produces fuzzy, silvery green leaves, and the flowers are produced in dense clusters of purple flowers in early summer to early autumn. This plant is often found in the wild in Northern Europe.
They prefer well-drained, moderately fertile soil in full sun.
Border, ornamental, medicinal, ground cover, walls and rock garden