Phlox Arendsii – Hesperis is from the Polemoniaceae family of plants. It has pyramid like clusters of purplish-pink, fragrant flowers in the summer. It is rather disease-free and easy to grow. It is a herbaceous perennial that grows well in the sun and fertile well-drained soil, but keep the roots cool and avoid watering from overhead.. Needs good air circulation in order to prevent powdery mildew. It does attract butterflies and hummingbirds.