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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.
The single flowers of the Carnations species, Dianthus caryophyllus have 5 petals and vary from white to pink to purple in color. Border Carnation cultivars may have double flowers with as many as 40 petals.When grown in gardens, Carnations grow to between 6 and 8.5 cm in diameter.arnations are also commonly referred to by their scientific name,  Dianthus , the name given by the Greek botanist Theopharastus. Carnations got the name Dianthus from two Greek Words - dios, referring to the god Zeus, and anthos, meaning flower. Carnations are thus known as the .