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by Matt Gibson. Bonus: you'll get spring-to-summer blooms. The Ajuga Chocolate Chip can be propagated by digging and dividing well established clumps in the fall or early spring. As they grow, they turn grayish-green with creamy gold margins. 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. Part of OSU Extension Plant Pathology Slide Set. Crown Rot of Perennials (Southern Blight) 1. For the treatment of this disease, you can simply pour a small amount of hydrogen peroxide on the affected area. There’s no treatment for crown rot, so if it shows up, you’ll need to remove and destroy the affected plants. ... Pathogenicity of crown rot and root rot disease of Ajuga reptans caused by Phoma sp. What's killing my ajuga? While I can’t be positive, it does look like your trees have crown rot. Runners are easily removed from the mother plant when they are young. Propagate by division any time during the growing season. Once the first signs of crown rot are noticed, it’s best to simply pull the infected plants and discard them promptly. How to Treat Crown Rot 1. Performance - Ajuga is excellent as a ground cover in shade where grass will not grow. Instead, water around shrubs and trees, so that they still have access to water but don't hold moisture near the crown. The blight that causes ajuga crown rot can affect many garden plants and can be difficult to control. Occasionally patches of ajuga will die. Occasionally patches of ajuga will die. The crown should never be covered with soil or the plant will rot and die. Every third year overcrowded groupings should be thinned to reduce crown rot. It is a trailing-rooting ground cover. -- Helen Hoffpauir. Other questions:subscriberservices@theadvocate.com. This will reduce the risk of the crown rot. Privacy Policy. Size and Method of spreading. You have permission to edit this article. Excavate surrounding soil. Carpet a shady spot, a slope or an area where grass won't grow with this tough groundcover. This coats them with a thin layer of protective oil to help prevent corrosion (use steel wool to remove any rust before doing this). The infection that caused the crown rot may also affect all the other plants eventually. The fungicide thiophanate-methyl applied as a drench may help stop the progress of the disease and prevent the continued spread. Plants can be buried, but do NOT place them in your compost pile. This treatment … Bases of stems rot and turn brown or black. Ajuga grows best in partial to full shade but will also grow in full sun if constant moisture is provided. Not surprisingly, my first orchid was a phalaenopsis from the grocery store. This will reduce the risk of the crown rot. This member of the mint family spreads fast and can become invasive. Then dig holes just deep enough for the root balls, spacing the holes 8 to 15 inches apart. The sclerotia story starts with hosta, the reigning glamor queen of shady northern landscapes. Divide the established clumps in fall or early spring and replant them, if desired. Good air circulation is essential to avoid crown rot. Use two tablespoons of Captan or Aliette fungicide to every one gallon of water you’ll use, and soak the soil deeply while it is mostly dry to allow the treatment to penetrate deeply into the soil. Good air circulation is essential to avoid crown rot. This will remove spent flowers spikes and impose a tidy, uniform appearance. Spruce up your outdoor space with products handpicked by HGTV editors. It presents gardeners with a tough decision in plant selection. Remove all of the diseased plants and dispose of them. A Pacific Northwest Extension Publication Oregon State University And avoid planting crown rot susceptible plants in the bed where the Ajuga died. Dan Gill's mailbag, Dan Gill, The Times-Picayune garden columnist. Dig out and replace the soil to a depth of 8 inches and 6 inches beyond the diseased area. 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Whorls of tiny, blue-violet flowers appear in mid to late spring on spikes rising above the foliage to 10". Ajuga grows best in partial to full shade but will also grow in full sun if constant moisture is provided. 2. They’re also great for growing underneath shrubs and trees. 3. If you're concerned that ajuga is considered an invasive in your region, visit the Invasive Plant Atlas. All rights reserved. Ajuga grows best in partial to full shade but will also grow in full sun if constant moisture is provided. Crown Rot of Hosta: Revenge of the South The American Civil War was over a long time ago, but not to some Southerners. How To Propagate Ajuga Reptans I've got a lot of it, and it was absolutely gorgeous blooming this spring. Provide good air circulation in hot and humid areas where crown rot is a problem. Photo by William M. Brown Jr., Bugwood.org via CC 3.0. Avoid planting too close to flower beds, lawns, or other areas where you'd have to keep removing it. Sites that are particularly wet or poorly drained will have this problem more than well-drained areas. 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. You’ll see ajuga used primarily as a bed edging plan and as a groundcover in fairly small spaces. Any white moldy looking stuff should also be removed and disposed of. Source: Jnzl. 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. It's a good idea to wipe the metal blades with an oily cloth. Comments - Ajuga needs to be divided every 2-3 years to prevent crown rot. 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. S. rolfsii. The nodes of the stolons are also very short, which creates very dense colonies ideal for preventing weeds from growing up through the plants. It will tolerate any soil, even poor ones, as long as it is well-drained. Inspect all plants before transplanting them into your garden for signs of crown rot to prevent spreading it to the... 2. If yours is a variegated form of Ajuga, be on the lookout for non-variegated leaves. 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. 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. At the time, I had no idea how much orchids would become a part of my life. Ajuga Crown Rot; September 2, 1998: Ajuga crown rot is one of the few major disease problems on this host. Comments - Ajuga needs to be divided every 2-3 years to prevent crown rot. Remove the soil from around the trunk and look at the crown. Otherwise, the only issue to be aware of is crown rot, also known as Southern blight. It is also recommended to thin out the larger, crowded groupings every two to three years. Plants suddenly turn yellow and die in patches during warm, humid weather. Propagating and Pruning Ajuga Plants. Ajugas seldom need fertilizing. The beloved shade tree, the American elm, is making a comeback, thanks to new varieties and cultivars that tolerate Dutch elm disease. These evergreen plants form dense mats of glossy leaves. Sclerotia. The leaves of the ajuga hold close together, which keeps them nice and short. can affect more than 500 different plant . In case you notice non-variegated foliage on variegated forms of Ajuga plants, make sure to remove it. 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. Also known as carpetweed or bugleweed, Ajuga reptans is a perennial that is typically hardy in zones 3 to 9. Water thoroughly to settle them in and eliminate air pockets. Crown rot of agave may present itself as gray or mottled lesions or, in extreme cases, the plant’s leaves may entirely turn gray or black and shrivel right where they grow out from the crown. ‘Burgundy Glow’ – Hardy in zones 3 to 9, this popular ajuga has blue flowers and tricolored foliage in shades of pink, cream and white. genera, including ornamentals, fruits, and vegetables. Volume (max. It will tolerate any soil, even poor ones, as long as it is well-drained. The fungus, Sclerotium delphinii, thrives in warm, wet weather, so it has done well in 1998. For some of these rot types, there are potent fungicides that can be used to prevent further spread. 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. Replace annual impatiens with shade loving perennials for a low maintenance landscape. Ajugas may be small, but these little groundcovers are durable and tough. The plants started declining from the outer leaves inward, and the center of the plant is the last to die. ANSWER: Ajuga (Ajuga reptans) is prone to a fungal root and crown rot caused by the Southern blight fungus (Sclerotium rolfsii). Dress up your yard’s shady spots with the fragrant blooms of an old-fashioned favorite. PNW Plant Disease Management . Cause The fungus Phoma sp. Gently loosen the plants’ roots, place them in the ground, and firm the soil around them. Usually, there’s little you can do to save plants, so prevention is important. Performance - Ajuga is excellent as a ground cover in shade where grass will not grow. But there are a few situations i… Treatment of Aquatic Weeds; Forestry and Hybrid Cottonwoods . Bases of stems rot and turn brown or black. It's a good idea to wipe the metal blades with an oily cloth. Crown and stem diseases. Can you make a recommendation on what to do? First is to isolate the plant to a place far from the other plants. Although it has pretty flowers and is available in several different cultivars that work well in landscaping, it can also make quite a nuisance of itself through rampant spread. Ajuga can be propagated by digging and dividing established clumps in the fall or early in the spring. Ajugas are low-maintenance plants that have good resistance to rabbits and deer. When you’re ready to replant, try a different kind of groundcover, to decrease the chance that the problem will return. It will tolerate poor soils, but should be placed in an area where it can be controlled. There’s no treatment for crown rot, so if it shows up, you’ll need to remove and destroy the affected plants. QUESTION: My beautiful chocolate chip ajuga has something that is killing it - could it be a fungus? ‘Catlin’s Giant’ – Eight to 10-inch spikes of deep blue flowers are held atop bronze-blue foliage. Though Rhizoctonia solanii can cause root rot, itis more active as a crown-rotting organism in perennials. Pruning your Ajugas is easy. To keep from making the problem worse, don't water at this point. It does have a tendency to spread into grass if not contained. The plants grow to 6 inches high and spread up to 28 inches. The basal leaves are up to 3" long and 1" across. 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. It is vulnerable to Southern blight, a soil-borne fungus also known as crown rot. One of the first problems I faced as a new orchid grower was crown rot. Propagate by division any time during the growing season. The plants grow 6 to 10 inches high. Use these silvery, gray-green or chartreuse plants as fillers and spillers in the garden. See our favorite shrubs that flower and flourish in the shadows. You can try a fungicide called metalaxyl that has some specificity for water molds (the type of organism that I … Crown rot can be a problem, especially in hot, humid areas or in heavy soils. Don't miss HGTV in your favorite social media feeds. Plants die quickly. Cell Size: 72 cell tray.Depth 2.35". You’ll see ajuga used primarily as a bed edging plan and as a groundcover in fairly small spaces. 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