Division: When planted outdoors in planting zones, 6a+ divide the Dianthus in the late fall before going dormant. Dig the plant up, giving plenty of room around the root ball. Remove the root ball and slice through the roots with a sharp knife or pruners. Replant in a full sun spot (6-8 hours) in a pH neutral to alkaline garden soil (7 pH) with good drainage or a container plant mix. Use your plant meter to ensure the soil pH is correct. Dig the hole twice as wide and the same depth as the original. Add root hormone at the bottom of the hole, place the root ball in the center, and water. Add compost and supplemental garden soil to the hole mixed with the native soil. Plant them in bright, indirect sunlight and water.