Dianthus plumarius 'Delilah Bicolor Purple' is a compact, mounding perennial grown for its fringed, bicolor purple flowers and tidy blue-green foliage. You will get the best flowering and the tightest habit in full sun, but it can tolerate part shade, especially where afternoons are hot.
Give it sharp drainage: sandy or gritty, well-drained soil is ideal, and raised beds or rock-garden conditions help prevent winter losses. Water to establish, then let the soil dry slightly between waterings; plants are more tolerant of short dry spells than of soggy roots. Aim for neutral to slightly alkaline soil when you can, and keep air circulation good to reduce foliar issues.
After the main flush of bloom, shear or deadhead to encourage a tidy mound and possible repeat flowering. Divide or take cuttings to refresh older clumps if the center thins. In colder areas, a light, breathable winter mulch can help protect crowns, but avoid heavy mulches that hold moisture.
Use this cultivar as an edging along paths, in gravel gardens, containers, and sunny borders where you want a low, fragrant accent. Space plants so foliage can fill in without crowding, and pair with other drought-leaning perennials that enjoy similar drainage and sun.