Verbena Bonariensis (7cm)
Loved by butterflies and bees, these exceptional summer favourites are a sight to see in the summer garden. A profusion of bold clusters will emerge in summer from tall, elegant stems, with each cluster made up of densely packed tiny purple flowers. This beautiful long-lasting perennial will flower from June all the way through to October for a show-stopping display. A winner of the RHS Award of Garden Merit.