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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.
Varieties. Bedding varieties of dianthus are often planted in mass or tucked into containers for bright color all summer. Some common series found for sale in our bedding plants area include the varieties featured here. Ideal Dianthus are 10-12â plants with clusters of picotee and solid colored flowers.