Buy Flowers › Verbena rigida 'Polaris' - 4" Pot Verbena rigida 'Polaris' - 4" Pot $6.50 Long blooming vervain with lavender clustered flowers, front of the border, 1.5' tall, sun, annual Add To Cart Added! Long blooming vervain with lavender clustered flowers, front of the border, 1.5' tall, sun, annual