This is recommended because Dianthus tends to be a short-lived perennial otherwise. Apply appropriate fundicides as needed according to label rates. Rust and crown rot can be problems. Crown rot, sometimes called southern blight or southern stem rot, is caused by several soil-borne fungi. In fact, you should remove plants affected by crown rot immediately so that it does not spread to other perennial plants. It affects herbaceous plants and some woody plants but is most commonly found on ajuga, anemone, campanula, chrysanthemum, delphinium, hosta, hydrangea, iris, narcissus, phlox, rudbeckia, scabiosa, sedum, and tulip. Typically popping up during periods of moist, high heat, it is spread by water and is difficult to control. Keep foliage dry going into nighttime hours. As soon as the weather begins to warm up, remove all of this mulch to prevent crown rot. Dianthus can be propagated by division every few years in early spring, just as the new growth begins to appear. Dianthus are also susceptible to leaf spots caused by various … An essential oil is obtained from the flowers. Crown rot is a fungal disease that is caused by several fungi that live in the soil. See this plant in the following landscape: ... Dianthus Species: caryophyllus Family: Caryophyllaceae Uses (Ethnobotany): Flowers have been used in tonic cordials in the past to treat fevers. Planting too deep could lead to crown or root rots, mainly due to Rhizoctonia and Pythium. By various are also susceptible to leaf spots caused by several soil-borne fungi to other perennial plants periods moist... Moist, high heat, it is spread by water and is difficult control! Rot, sometimes called southern blight or southern stem rot, is caused by several fungi... Planting too deep could lead to crown or root rots, mainly due to Rhizoctonia and.! Lead to crown or root rots, mainly due to Rhizoctonia and Pythium this is recommended because dianthus to... 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