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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.
Growing Dianthus Plants from Seed. You can start Dianthus seeds indoors 6 to 8 weeks before the. last frost is expected for spring planting and blooms during the first year. If you prefer, you can sow the seeds directly into a sunny location. in the garden in the spring or early in the summer.Plant your seeds 1/8 deep in light, well-drained soil.rowing Dianthus Plants from Seed. You can start Dianthus seeds indoors 6 to 8 weeks before the. last frost is expected for spring planting and blooms during the first year. If you prefer, you can sow the seeds directly into a sunny location. in the garden in the spring or early in the summer.