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