Otherwise, it is fairly impervious to pests and diseases. The crown should never be covered with soil or the plant will rot and die. by Matt Gibson. has been found in greenhouse grown plants by the OSU Plant Clinic and reported from Georgia. It first appears as sudden wilting and dieback in colder climates and yellowing and death of plants in warmer areas. Propagating and Pruning Ajuga Plants Pruning your Ajugas is easy. Ajuga reptans, commonly called bugleweed, is a dense, rapidly spreading, mat-forming ground cover which features shiny, dark green leaves. The crown should never be covered with soil or the plant may rot. Plant Ajugas 12 to 15 inches apart, being careful not to plant too deeply. VIDEO Created by Elisabeth Meyer for " Annuals, Perennials, Vines, and Groundcovers " a plant identification course offered in partnership with Longwood Gardens. Spots appear on the crown (where stem and roots meet), lower leaves rot and young shoots wilt. Some of the miniature varieties make great additions to trough gardens and containers. Additionally, very heavy soil will cause crown rot. Ajuga-Crown Rot. Diseases, Insects, and Other Plant Problems: Crown rot can be a problem in deep Southern humid conditions and in heavy soils. Ajuga plants should be planted or transplanted in the garden in early spring. Crown rot is a nasty disease that affects many plants, mainly garden vegetables. Ajuga plants are subject to crown rot if they are overcrowded or if conditions are too humid. Whorls of tiny, blue-violet flowers appear in mid to late spring on spikes rising above the foliage to 10". Ajuga does best in well-drained, moist soil but handles drought and dry soils well. Note the discoloration at the base of the stems due to a Sclerotium sp. It is also recommended to thin out the larger, crowded groupings every two to three years. Part of OSU Extension Plant Pathology Slide Set. The fungus attacks very suddenly, causing plants to collapse, wilt and die. You’ll see ajuga used primarily as a bed edging plan and as a groundcover in fairly small spaces. This fungal disease is most common in warm wet or humid weather. Fertilizing: Ajuga seldom needs fertilizing. This will reduce the risk of the crown rot. The biggest concern is to make sure the plant doesn't get too wet because crown rot is a common problem. It is vulnerable to Southern blight, a soil-borne fungus also known as crown rot. In case you notice non-variegated foliage on variegated forms of Ajuga plants, make sure to remove it. Winterizing: No specific care needed Maintenance & Pruning: Can be propagated by digging and dividing established clumps in the fall or early in the spring. Over-fertilizing can lead to crown rot. ANSWER: This is crown rot, a common problem of ajuga in Louisiana. Cause The fungus Phoma sp. It tolerates deer and rabbit and does well planted under and around Black Walnut trees. 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