Easy to grow in almost any kind of soil, ajugas like a moist location that drains easily, but they can withstand short periods of drought. Runners are easily removed from the mother plant when they are young. Spots appear on the crown (where stem and roots meet), lower leaves rot and young shoots wilt. Ajuga-Crown Rot. Pruning your Ajugas is easy. Look for products such as Bonide Infuse Systemic Disease Control Lawn and Landscape; Ferti-lome Halt Systemic Rose, Flower, Lawn, Ornamental Fungicide; or SA-50 Thiomyl Turf and Ornamental Systemic Fungicide and follow label directions carefully. It first appears as sudden wilting and dieback in colder climates and yellowing and death of plants in warmer areas. Comments - Ajuga needs to be divided every 2-3 years to prevent crown rot. Replace annual impatiens with shade loving perennials for a low maintenance landscape. Crown Rot of Hosta: Revenge of the South The American Civil War was over a long time ago, but not to some Southerners. See our favorite shrubs that flower and flourish in the shadows. Plants suddenly turn yellow and die in patches during warm, humid weather. You’ll have to be mindful about keeping it controlled in your planting area. Their latest weapon? ANSWER: Ajuga (Ajuga reptans) is prone to a fungal root and crown rot caused by the Southern blight fungus (Sclerotium rolfsii). Treatment of Aquatic Weeds; Forestry and Hybrid Cottonwoods . Because ajuga naturalizes easily, spreading by stolons, or horizontal stems that creep along the ground, you'll want to think about where you plant it. Crown rot is a nasty disease that affects many plants, mainly garden vegetables. ... Pathogenicity of crown rot and root rot disease of Ajuga reptans caused by Phoma sp. This will remove spent flowers spikes and impose a tidy, uniform appearance. ‘Black Scallop’ – Add near-black to your yard or garden with this very dark ajuga, which has blue flowers and purple-black leaves with scalloped edges. It is also recommended to thin out the larger, crowded groupings every two to three years. It will tolerate poor soils, but should be placed in an area where it can be controlled. This will reduce the risk of the crown rot. Dig out and replace the soil to a depth of 8 inches and 6 inches beyond the diseased area. You’ll recognize it by signs of rot on the lower leaves and spots on the crowns of the plants. It will tolerate any soil, even poor ones, as long as it is well-drained. Phytopathology 95:S111. Also known as carpetweed or bugleweed, Ajuga reptans is a perennial that is typically hardy in zones 3 to 9. Good air circulation is essential to avoid crown rot. Volume (max. Meet one of the best groundcovers for shade that delivers evergreen color year round. Provide good air circulation in hot and humid areas where crown rot is a problem. Coat wooden handles with wood sealer, tung oil or varnish to keep them in good shape. Southern Blight (fungus – Sclerotium rolfsii): Southern Blight, also called Crown Rot, is a soil-borne disease of ajuga that will be more serious in poorly drained soils. Join the party! Good air circulation is essential to avoid crown rot. They can help control erosion on a bank or hill, fill in a patchy lawn where grass refuses to grow, or simply add color to shady spots. This coats them with a thin layer of protective oil to help prevent corrosion (use steel wool to remove any rust before doing this). Sudden wilting, yellowing and death of ajuga, also known as bugleweed, means crown rot may have invaded the planting.. If yours is a variegated form of Ajuga, be on the lookout for non-variegated leaves. Phytophthora crown rot on a young apple tree. Don't miss HGTV in your favorite social media feeds. Size and Method of spreading. Try to avoid using chemical herbicides near ajuga, they seem to promote rot in existing plants. This low-growing bugleweed will spread in the garden by stolons ( reptans means creeping) to form an attractive, mat-like ground cover. dry) cubic inches: 2.23 Recommended Finish Size: 1 gallon Growing Media: Well-draining commercial media Growing Temperature: 65-75 F (days) 55-65 F (nights) Soil PH: 5.8-6.2 Soil EC: 1.8-2.2 Finish Time for Spring Sale: 8 - 10 weeks Growing Info: Apply fungicide drench at transplant. Ajuga Crown Rot; September 2, 1998: Ajuga crown rot is one of the few major disease problems on this host. In case you notice non-variegated foliage on variegated forms of Ajuga plants, make sure to remove it. Your tree may have an obvious decline that could be due to many factors, including fire blight and winter injury. Avoid planting too close to flower beds, lawns, or other areas where you'd have to keep removing it. Ajuga grows best in partial to full shade but will also grow in full sun if constant moisture is provided. Ajugas are low-maintenance plants that have good resistance to rabbits and deer. Cause The fungus Phoma sp. They don’t require pruning, but if you want to make them look a bit neater after the blooms are finished, mow over them with your mower on a high setting. Four grasslike plants that thrive in shady gardens. Water thoroughly to settle them in and eliminate air pockets. Get our best gardening advice and outdoor ideas delivered straight to your inbox. They're still mad about losing, and they're fixin' to get even. These evergreen plants form dense mats of glossy leaves. has been found in greenhouse grown plants by the OSU Plant Clinic and reported from Georgia. When you’re ready to replant, try a different kind of groundcover, to decrease the chance that the problem will return. Comments - Ajuga needs to be divided every 2-3 years to prevent crown rot. This treatment … 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. PNW Plant Disease Management . As they grow, they turn grayish-green with creamy gold margins. You’ll probably want to thin your ajugas every three years or so, to prevent them from becoming overcrowded. ‘Burgundy Glow’ – Hardy in zones 3 to 9, this popular ajuga has blue flowers and tricolored foliage in shades of pink, cream and white. Otherwise, the only issue to be aware of is crown rot, also known as Southern blight. Divide the established clumps in fall or early spring and replant them, if desired. It does have a tendency to spread into grass if not contained. I first began growing orchids over 10 years ago. 3. The nodes of the stolons are also very short, which creates very dense colonies ideal for preventing weeds from growing up through the plants. QUESTION: My beautiful chocolate chip ajuga has something that is killing it - could it be a fungus? Once crown rot has entered a planting it is easily spread by sclerotia clinging to soil on shoes, tools, and plant material. For some of these rot types, there are potent fungicides that can be used to prevent further spread. You can do it by simply mowing or cutting the foliage back to the ground. Ajuga can be propagated by digging and dividing established clumps in the fall or early in the spring. Plants suddenly turn yellow and die in patches during warm, humid weather. It does look like there's some white moldy looking stuff on some of the roots. To keep from making the problem worse, don't water at this point. They are evergreen or semi-evergreen, obovate (spoon-shaped), and nearly hairless. ‘Toffee Chip’ – This variety, which is hardy in zones 3 to 10, has new leaves that start out light brown. The plants grow 6 to 10 inches high. The fungus, Sclerotium delphinii, thrives in warm, wet weather, so it has done well in 1998. To prevent this disease, give your plants good air circulation and avoid overfertilizing. Good air circulation is essential to avoid crown rot. Note the discoloration at the base of the stems due to a Sclerotium sp. Source: Jnzl. A bit more information: Reduce the risk of crown rot to healthy plantings by thinning groundcover plantings every few years or before they become overcrowded. At the time, I had no idea how much orchids would become a part of my life. 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. Though Rhizoctonia solanii can cause root rot, itis more active as a crown-rotting organism in perennials. You’ll see ajuga used primarily as a bed edging plan and as a groundcover in fairly small spaces. They can take sun to partial shade, although the foliage develops its best color in full sun. orchid crown rot – treatment and prevention. Any white moldy looking stuff should also be removed and disposed of. Whorls of tiny, blue-violet flowers appear in mid to late spring on spikes rising above the foliage to 10". In case you want to replant Ajugas on the same spot, make sure to try a different kind of ground cover in order to decrease the chance … Usually, there’s little you can do to save plants, so prevention is important. Privacy Policy. ‘Blueberry Muffin’ – Vigorous and fast-spreading, ‘Blueberry Muffin’ has deep blue flowers and thick leaves that hold up well even in harsh weather. The infection that caused the crown rot may also affect all the other plants eventually. In case you notice non-variegated foliage on variegated forms of Ajuga plants, make sure to remove it. A Pacific Northwest Extension Publication Oregon State University Bonus: you'll get spring-to-summer blooms. can affect more than 500 different plant . You can do it by simply mowing or cutting the foliage back to the ground. Occasionally patches of ajuga will die. Propagate by division any time during the growing season. It presents gardeners with a tough decision in plant selection. Discover some of the best shade annuals, and learn tips for choosing these shady characters. It is vulnerable to Southern blight, a soil-borne fungus also known as crown rot. Gently loosen the plants’ roots, place them in the ground, and firm the soil around them. You have permission to edit this article. Divide plants if they become overcrowded. Occasionally patches of ajuga will die. If your ajugas are planted in shade, try companion plants like coral bells, hostas, ferns, daffodils, astilbe, forget-me-not, violas, hardy geraniums and other woodland plants. VIDEO Created by Elisabeth Meyer for " Annuals, Perennials, Vines, and Groundcovers " a plant identification course offered in partnership with Longwood Gardens. Red/orange fungal spores may also be obvious near the plant crown. The beloved shade tree, the American elm, is making a comeback, thanks to new varieties and cultivars that tolerate Dutch elm disease. In fact, it is more of a pest itself than it is a pest to other plants. Peel back the bark from the trunk. Trailing-rooting ground covers have trailing stems that spread out from a central root system. First is to isolate the plant to a place far from the other plants. If you're concerned that ajuga is considered an invasive in your region, visit the Invasive Plant Atlas. Ajugas seldom need fertilizing. Plants can be buried, but do NOT place them in your compost pile. The problem in Georgia was attributed to infected plants coming in from plug production facilities in Central America. Ajugas are especially nice because they hold their leaf color and stay attractive almost all year-round, and they bear blue, purple or white flowers from spring into summer.