Dianthus Doesnt Flower. Camellia Plant Diseases and Spider Mites. At least now I know.
Check your dianthus plants for spent wilted or dead flowers. Divide perennial dianthus clumps once every three or four years. They bloom heavily in the spring on into the summer and if you deadhead them remove the spent flowers after blooming they are likely to bloom again even into the fall.
Feed every month during the growing season with water-soluble fertilizer.
They love full sun and do well in. Dianthus does well in any well-drained soil though it prefers a slight alkalinity. Partial Sun Drought Resistant Flowers for a Window Box. They typically bloom in spring and summer.