Verbena officinalis, the common vervain or common verbena, is a perennial herb native to Europe. It grows up to a metre/yard high, with an upright habitus. The lobed leaves are toothed, the delicate spikes hold mauve flowers.
A very beautiful, very interesting looking plant. Frilly, double, midnight-purple fluted horns or trumpet flowers, with white interiors burst open in profusion throughout the Summer.