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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 reason the Dianthus barbatus plant is called Sweet William has been forgotten, but the poetry of the name fits the pleasant aroma and bright range of possible colors. Full-grown plants reach 12-inches (30 cm) or more in height, depending on variety.ind out when your Sweet William will bloom. Due to the multiple varieties of Sweet William and the different methods of growing them, you may hear conflicting information on when your flowers will grow and how long they will last.