Crown and Roots Rot; Odor Present is Caused by Crown Rot Soil-dwelling fungi cause this serious disease, which can kill plants within a few days. This will reduce the risk of the crown rot. Pruning your Ajugas is easy. ANSWER: This is crown rot, a common problem of ajuga in Louisiana. Ajuga plants should be planted or transplanted in the garden in early spring. Fertilizing: Ajuga seldom needs fertilizing. The crown should never be covered with soil or the plant may rot. It tolerates deer and rabbit and does well planted under and around Black Walnut trees. Ajuga plants are subject to crown rot if they are overcrowded or if conditions are too humid. Otherwise, it is fairly impervious to pests and diseases. Spots appear on the crown (where stem and roots meet), lower leaves rot and young shoots wilt. You can do it by simply mowing or cutting the foliage back to the ground. Note the discoloration at the base of the stems due to a Sclerotium sp. Propagating and Pruning Ajuga Plants Try to avoid using chemical herbicides near ajuga, they seem to promote rot in existing plants. It is vulnerable to Southern blight, a soil-borne fungus also known as crown rot. This garden malady is caused by a fungus that sometimes develops in the soil when the location has experienced many heavy rains, flash floods, or other reasons for lots of lots of water in one location. In case you notice non-variegated foliage on variegated forms of Ajuga plants, make sure to remove it. has been found in greenhouse grown plants by the OSU Plant Clinic and reported from Georgia. Sudden wilting, yellowing and death of ajuga, also known as bugleweed, means crown rot may have invaded the planting.. Ajuga-Crown Rot. This fungal disease is most common in warm wet or humid weather. The biggest concern is to make sure the plant doesn't get too wet because crown rot is a common problem. The fungus attacks very suddenly, causing plants to collapse, wilt and die. The crown should never be covered with soil or the plant will rot and die. It is also recommended to thin out the larger, crowded groupings every two to three years. Ajuga Reptans Main Pest or Disease Problems. VIDEO Created by Elisabeth Meyer for " Annuals, Perennials, Vines, and Groundcovers " a plant identification course offered in partnership with Longwood Gardens. You’ll see ajuga used primarily as a bed edging plan and as a groundcover in fairly small spaces. Crown rot is a nasty disease that affects many plants, mainly garden vegetables. Additionally, very heavy soil will cause crown rot. Ajuga does best in well-drained, moist soil but handles drought and dry soils well. Diseases, Insects, and Other Plant Problems: Crown rot can be a problem in deep Southern humid conditions and in heavy soils. Winterizing: No specific care needed Maintenance & Pruning: Can be propagated by digging and dividing established clumps in the fall or early in the spring. 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