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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.
Dianthus, genus Dianthus(noun) carnations and pinks. Dianthus(Noun) A genus of about 300 species of flowering plants in the family Caryophyllaceae, including carnations, pinks, and sweet william. dianthus(Noun) Any plant, such as carnations and pinks, of the genus Dianthus. Dianthus(noun) a genus of plants containing some of the most popular of cultivated flowers, including the pink, carnation, and Sweet William.