Growing to 40-90 cm tall in June-September. The blue pigment is protocyanin, which in roses is red.
Native to Europe and a seed contaminant in crop seeds, now naturalised in many other parts of the world, including North America and parts of Australia.
National flower of Estonia and Poland.
Also the symbol of the Estonian political party, Rahvaliit, the Finnish political party, National Coalition Party, and the Swedish political party, Liberal People's Party.