It is best grown in a free-draining, sheltered corner of the yard. 'Plumbago is fully hardy in US hardiness zones 9 to 11,' says Tricia Hunt, plant expert and owner of Millstone Nursery.

Butterflies love it. Plumbago is a 4-foot, mounding perennial shrub with sky blue or white blooms. Blue plumbago is a root-hardy perennial for the Houston garden. For the most part, it's pest ...