Verbena
A large genus of South American plants. Generally for warmer soils the following vervains are hardy here with us. Verbena bonariensis being such a useful long flowering plant, although prone to prolific seeding for some. Verbena corymbosa (now Glandularia corymbosa) is the odd one out thriving at the waters edge where it runs amongst other stronger plants looking especially lovely with yellow trollius (globeflowers) or hemerocallis (daylilys).