Phlox paniculata 39laura39 is a striking herbaceous perennial producing clusters of scented mauve45purple flowers with white centres and a dark central eye an essential ingredient in herbaceous and cottage garden borders phlox 39laura39 has a tall upright growth habit and forms large clumps which bloom over a long period from july to september filling the air with perfume on warm summer evenings this perennial phlox also has good mildew resistance for an easy display try cut