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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.
Cultivation [edit]. Dianthus species have been extensively bred and hybridised to produce many thousands of cultivars for garden use and floristry, in all shades of white, pink, yellow and red, with a huge variety of flower shapes and markings.They are often divided into the following main groups:-.ianthus species are used as food plants by the larvae of some Lepidoptera species including Cabbage Moth, Double-striped Pug, Large Yellow Underwing and The Lychnis.