Vigorous catmint with small, tubular, lavender-blue flowers held in clusters of upright stems from June to July and attractive, aromatic, light grey-green foliage. This tall perennial will form a dense mound that looks wonderful in the middle of a sunny border alongside other blue or silver-leaved plants. The flowers are highly attractive to bees, and of course, the foliage to cats, who will go mad for it. To prevent them from completely flattening it, insert several twiggy sticks into the centre of the plant.