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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 barbatus (Sweet William) is a species of Dianthus native to southern Europe and parts of Asia which has become a popular ornamental garden plant.It is a herbaceous biennial or short-lived perennial plant growing to 30â75 cm tall, with flowers in a dense cluster of up to 30 at the top of the stems.ianthus barbatus (Sweet William) is a species of Dianthus native to southern Europe and parts of Asia which has become a popular ornamental garden plant.