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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 flowers have fragrant blooms, that are 1 to 1 1/2 diameter. Most varieties of Dianthus will grow 18 to 24. They look great in a flowerbed, or a rock garden. They can be planted singly, or in groups. Plant Propagation: Dianthus are grown from seed.