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The dianthus plant is also called Sweet William (Dianthus barbatus) and has a fragrance with cinnamon or clove notes. The plants are small and usually between 6 and 18 inches tall.nstructions on how to care for dianthus are very straightforward. Water the plants when dry and apply fertilizer every six to eight weeks. You may also work a slow-release fertilizer into the soil at planting, which will release you from the need to feed the plants.
Perennial varieties of Dianthus can be propagated by tip cuttings, layering and division. Softwood tip cuttings taken from your Dianthus plants in the spring or in early summer. will be ready to be planted in the garden by fall. However, plants grown from cuttings will not flower until the following year. Dianthus are easily propagated by digging and dividing established clumps.