Also called night phlox, the tiny round blooms remain tightly curled up, but by evening they uncurl into sweetly scented, star-shaped, pink and white flowers blooming from mid to late summer. It looks lovely in a night garden when combined with other fragranced plants like nicotianas, night-scented stocks and summer phlox. Grows to a foot tall and produces a profusion of small, almost daisy-like flowers. For best results, grow in moist, humus-rich, well-drained soil in full sun. Cut it back hard once flowering has finished. Reduce watering in winter. Photo courtesy of Shire Plants in the UK.