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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.They can also be propagated by cuttings.Dianthus seeds can be directly seeded into your flower garden, or started indoors for transplanting later. Dianthus prefers warm weather. If planting outdoors, sow them after the soil has begun to warm in the spring.lant Propagation: Dianthus are grown from seed. They can also be propagated by cuttings. Dianthus seeds can be directly seeded into your flower garden, or started indoors for transplanting later. Dianthus prefers warm weather. If planting outdoors, sow them after the soil has begun to warm in the spring.