Its trailing habit of quilted fragrant foliage sprawls along a sunny path blanketed with clusters of twinkling lavender-purple flowers. Favored by hummingbirds and butterflies, Nepeta Nova Blue, a long bloomer, will be a prime target. Nepeta are smothered with blossoms in summer. One of the best perennials to edge or underplant a rose bed. Its long flowering season, quick overall growth time and carefree habit will also look lovely in a hanging basket.