Flowers, leaves and root are edible.
Leaves and young shoots can be cooked.
The juice of the roots is an effective antidote in cases of arsenic poisoning...
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.