The plant is about 7 feet tall and 6 feet in diameter. foggers Posts: 2. Splitting bark is a dangerous problem and rhododendrons distressed this way may die back. Leaf curling has absolutely nothing to do with leaf hydration on a healthy plant. While leaves die, they may remain brown and crispy on branches until they fall off in summer. When the leaves curl, these pores are protected, and the evaporation of additional water is reduced. glossy green leaves and bountiful blooms. For many varieties that have burned in the sun in the past, the cause was lack of water not too much sun. Misting when temperatures exceed 95 degrees F can help. It hardly set any … In this case, the soil’s pH must be checked. A newly planted rhododendron will droop even if the soil conditions surrounding the plant are moist. Leaf curl on Rhododendrons is most frequently seen when the plants are under stress from drought, stem injury or cold temperatures. Inclusion of a product does not indicate a recommendation or endorsement by the RHS. An infested rhododendron will exhibit roots that are rust in color. The shrub is remarkably hardy in the right growing conditions. Buds Don’t Open . If your rhododendron is injured every year move it to a new location in early March. This year the leaves are drooping and the flower buds (of which there are many) are just not opening. The rhododendron did receive waterings when the leaves started to look a bit limp. Follow the directions on the label for application. Apply a 2- to 3-inch layer of mulch for best results, but keep the mulch away from the trunk of the shrub. This can be caused by nutrient poor soils (such as sandy soils) but in my case the cause was adding mulch to the surrounding soil of the azalea. After we cut large conifers which shaded a 30 year old rhododendron, this one became exposed to morning and mid day Sunlight instead Of just afternoon sun. Rhododendrons encounter diseases, fungi, and climatic issues that can result in brown spots, or even entirely brown leaves. Correct drooping leaves by … I have a Rhododendron in a pot which flowers beautifully from early June. Rhododendrons (including deciduous azaleas) may be attacked by several diseases, causing unsightly foliage or a lack of flowers. I have a rhododendron. Wilting Rhododendrons. Leaf angle (drooping) is a result of hydration in the petiole (leaf stem). If the air temperature tops 95 degrees F, the foliage will often droop. Rhododendrons are lovely plants with enchanting blooms that range from dark red to lavender. Sometimes one or more of these are contributing factors because if the rhodys went into the winter season dry from summer drought they are then more likely to be further stressed by cold winters. If you try to pull up the roots, the stem may break. Rhododendrons will droop during a drought when the weather is dry and the humidity is low. I'm quite new to gardening and new to this forum. Its symptoms begin with brittle, reddish-brown roots close to the soil. If you see curled up leaves in the summer, though, that is a sign that your Rhododendron is much too dry. Leaf curl on Rhododendrons is most frequently seen when the plants are under stress from drought, stem injury or cold temperatures. Leaves are the best indicators of plant problems. They will not tolerate alkaline soil conditions: their leaves go yellow, growth is stunted and they eventually fail. If you have clay soil, amend it to improve draining before you plant rhododendrons. of the leaf. Rolled Up Leaves in Summer Could Be a Sign of Dry Soil Much like any other plant, if a rhododendron doesn't get enough water, it will wilt. Leaf drooping may actually be a response to increased light. Jun 10, 2003 Canoneer . Water immediately! A good choice for mulch is bark chips, pine needles or large leaves lightly raked over the soil. The rhododendron did receive waterings when the leaves started to look a bit limp. Bud Blast. Within in the past week or so I noticed that the leaves were drooping a bit, but wasn’t too concerned. Yellow rhododendron leaves often represent the plant’s expression of dissatisfaction with its care. The plants are able to survive and bloom for many years. Rhododendrons are an evergreen bush, which means it sports leaves throughout the year. (Botryosphaeria (canker), Phytophthora cactorum, P. ramorum, P. kernoviae) These can be serious diseases of rhododendrons particularly in regions with considerable summer heat and or humidity. A rhododendron planted too deeply in soil will often develop phytophthora root rot. Rhododendrons are flowering shrubs in the Rododendron genus that come with both evergreen and deciduous species. They are characterised by the sudden wilting and death of a branch or part of a plant and tend to attack where plants have been physically damaged in some way. Throughout the growing season, they are generally shaded by the overstory. Drought could have been a major factor in your Rhododendrons brown leaves. Troubleshoot your rhododendron by taking a small cutting to a local Master Gardener for a diagnosis. Nighttime is often the best time to see adult weevil activity. © Copyright 2020 Hearst Communications, Inc. The soil should never be soggy wet, but it should be moist to the touch. My rhododendron, planted last spring, has all of a sudden got a massive droop on. The pores through which the plant loses water and takes up air are located on the underside of the leaves. Though we generally don't think about photosynthesis in the winter months, evergreen plants actually experience the highest light intensities of the year during this time period. Splitting bark is a dangerous problem and rhododendrons distressed this way may die back. Rhododendrons will droop during a drought when the weather is dry and the humidity is low. Slow die-back on azaleas and rhododendrons is a pretty common occurrence. Correct drooping leaves … This drooping is not caused by disease or insects, but rather the rhododendron’s natural reaction to windy, dry, cold weather. Treatment is best carried out in early summer when the newly hatched nymphs are present, but further treatment may be required. Allow the water to slowly drip out so the root ball can become moist. During a cold snap, your rhododendron’s leaves may droop, but should usually recover when milder weather returns. I have a Rhododendron in a pot which flowers beautifully from early June. The leaves of the smaller azalea are usually pointed and narrow; the leaves of the rhododendron are generally large and leathery.. All rhododendron varieties naturally droop and roll their leaves up tightly during very cold weather. During Summer, it is … They need water fast, and they will pick up fast, but damage may have been done which will not show again for about 6 months when the plant starts to collapse. Over the past few weeks, however, I notice that while much of the plant looks good (leaves appear normal), parts of the plant just seem to be dying off - leaves curl up and then just fall off. Indeed, as temperatures drop, the leaves of these evergreen shrubs frequently droop and … Sometimes new roots may be observed to regenerate near the root crown of the plant. It seems to be happening in sections of the plant. My rhododendron, planted last spring, has all of a sudden got a massive droop on. To remedy this cause of droop in a new plant, set a dripping hose at the base of the shrub. Mist the plant every afternoon even if the nights are cold or windy. Weevils can cause a Rhododendron to droop and die. Several people have expressed alarm at the drooping leaves on their rhododendrons during the recent cold weather. Weevils can cause a Rhododendron to droop and die. Early weevil identification is important to save the rhododendron. Discovering the cause will make treatment options much more effective, and employing basic preventive practices will enable you to avoid the problems in the future. Look for adult weevils on the rhododendron during the day. Watering in the summer when temperatures are high and drought is possible is also important for preventing summer stress burns. What Causes Gardenia Plants to Turn Yellow? Not just the leaves, but the entire top 5 inches of each stem have dropped … I purchased an expensive yellow-flowering rhododendron back in May and planted it in a raised foundation planting I have on the north side of my home. All of a sudden it became wilted looking, the leaves rounded out and it looked ill. We had some major rains, and it seemed to perk up some. Phytophthora root rot can cause a rhododendron to suddenly droop and then die. Rhododendron diseases. Rhododendrons will grow in U.S. Department of Agriculture plant hardiness zones 4 through 9, depending on the cultivar. They’re just reacting to cold temperatures. There is nothing more disappointing than seeing your Rhododendron covered in buds and then not getting any flowers! Rhododendron leaves curl and droop during the summer months...if they lose too much water, just as other plants wilt. Paint splits with a grafting compound or tree wound sealer. To avoid drying out, the leaves close their stomata, causing them to curl and droop. Why Is My Rhododendron Drooping? By far the most popular group of plants in this category are the Rhododendrons. Once a section becomes afflicted the progress of the affliction spreads rapidly. Inclusion of a product does not indicate a recommendation or endorsement by the RHS. To avoid drying out, the leaves close their stomata, causing them to curl and droop. This year the leaves are drooping and the flower buds (of which there are many) are just not opening. Messages: 10 Likes Received: 0 Location: Sunshine Coast, BC, canada. Also purchase a foliar spray to control the adult weevils. Trusses, of up to ten bell-shaped flowers, are borne in late winter and early spring ranging in colour from … Details R. sutchuenense is a large evergreen shrub or small tree, eventually reaching up to 8m in height, with drooping leaves, up to 30cm long, and thick young shoots. Plants “breathe” through stomata, pores in their leaves. curl in summer... Rhododendron leaves curl and droop during the summer months...if they lose too much water, just as other plants wilt. When brown leaves show up in a rhododendron, it's usually at winter's end -- right before flowering time. Many a Rhodo lover has said that they can tell how cold it is outside by looking at Rhododendron leaves. (Botryosphaeria (canker), Phytophthora cactorum, P. ramorum, P. kernoviae) These can be serious diseases of rhododendrons particularly in regions with considerable summer heat and or humidity. Adequate shade will protect plants in summer and wind blocks will help them avoid damage in both winter and summer. Now the leaves are turning a rust color, curling upward, and falling off. Do not plant a rhododendron in water-logged soil conditions or near areas of spring water runoff or buildup. The most common cause is the disease Phytophthora cinnamomi. This happens just before winter or in summer drought. Biology. Some rhododendrons hold their leaves for a season, dropping the older leaves in spring, fall or both seasons. Here in the northeast it's been around 100 degrees and two days ago noticed the plant was drooping excessively, so I watered it. She writes for numerous online publications. Some of the most common dangers to your rhododendron include aphids, root rot and Japanese beetles. I have a 10+ year old rhododendron. The larvacidal drench can be purchased at a garden center. droopy rhododendron. That tongue … The fungus is quite prevalent in wet, poor-draining soil that has a strong clay base. It marks rhododendron leaves with unsightly pock-marked yellowish spotting on the upper surface during the summer. I have a rhododendron. If the vole chews all the way around the trunk, the plant will die. The plant has some shade and the soil has some clay. To help prevent this make sure the shrub has sufficient water. The rhododendron can droop even if the air temperature is not extremely hot. Plan the perfect garden with our interactive tool →, Image by Flickr.com, courtesy of mozzercork, Image by Flickr.com, courtesy of Pete Birkinshaw, Image by Flickr.com, courtesy of Margaret Anne Clarke, Image by Flickr.com, courtesy of off to London for a while) (Kathleen Conklin, Image by Flickr.com, courtesy of Hans-Peter, Image by Flickr.com, courtesy of Sharon Mollerus, American Rhododendron Society: Rhododendron Care, University of Missouri: Growing Azaleas And Rhododendrons, Ohio State University: Growing Rhododendrons. However these, and several others, need acid soil to thrive. In addition, both amateur professional rhododendron enthusiasts have made countless reports of leaf curling in various rhododendron species. This is most pronounced on the rhododendron varieties with thick, waxy leaves. Based in Oregon, Kimberly Sharpe has been a writer since 2006. ! You can keep your rhododendrons healthy and looking the way you want them to by … Leaf scorch also can occur when rainy, overcast weather is suddenly followed by windy, sunny days. The disease is found most often in areas where water runoff collects around rhododendron roots. The leaves are just trying to conserve water in the cold, dry air. Biology. Rhododendrons encounter diseases, fungi, and climatic issues that can result in brown spots, or even entirely brown leaves. It wintered over well this past season and had about 5 clumps of flowers. If the shrub continues to droop during the early morning hours, water the rhododendron thoroughly. The shrub's colorful blossoms are meant to be viewed against a lustrous backdrop of green. Buy disease-free rhodendron plants from a reputable nursery and avoid those that have dark, discolored roots, appear wilted in the morning or are not the normal green color. Why Does My Rhododendron Have Yellow Leaves? Q: I got through winter relatively unscathed, but one problem is a large, 35-year-old rhododendron that has wilted, curling leaves on about a third of the branches. It was doing well all this year with new limbs and growth. This is because the plants root ball remains dry despite the surrounding moisture. There are cultivars available with some resistance to phytophtora dieback. It's affected by soil & atmospheric moisture levels & outside air temperatures. Not just the leaves, but the entire top 5 inches of each stem have dropped to one side. It is a sorry looking specimen! The bottom of the stem near the soil will be discolored brown, and the roots will look blackened and soggy. Spray the foliage with a fine water mist every day during extreme heat. Flowers come in a wide variety of pinks, purples, reds and white. Several people have expressed alarm at the drooping leaves on their rhododendrons during the recent cold weather. They are characterised by the sudden wilting and death of a branch or part of a plant and tend to attack where plants have been physically damaged in some way. The shrub will simply droop due to low humidity. Our summer has been more humid than usual. They are great for landscaping and produce beautiful flowers in the spring and summer. Reviewin… When the leaves curl, these pores are protected, and the evaporation of additional water is reduced. It was doing well all this year with new limbs and growth. Fungicides that will suppress but not eliminate phytophthora dieback include those containing the active ingredients mefenoxam and metalaxyl. The pores through which the plant loses water and takes up air are located on the underside of the leaves. When the leaves are yellow but the region along the veins remains dark green, the plant likely suffers from chlorosis, which is caused by a magnesium, nitrogen or iron deficiency. If the shrub continues to droop during the early morning hours, water the rhododendron thoroughly. Each year your rhododendron will shed a proportion of its foliage during the spring and summer, mainly older leaves. When temperatures drop below freezing, rhododendron leaves may cup and curl at the edges and droop. She has traveled extensively to such places as India and Sri Lanka to widen and enhance her writing and knowledge base. It’s actually a species native to Connecticut, I was told. It is not lack of water as the pot is watered regularly. This is most pronounced on the rhododendron varieties with thick, waxy leaves. Burned tips on this year's new growth is typically indicative of lack of water as the plant withdraws water from the tips of the new foliage first. Phytophthora root rot can cause a rhododendron to suddenly droop and then die. Leaf curl on Rhododendrons is most frequently seen when the plants are under stress from drought, stem injury or cold temperatures. Paint a tree sealant onto the damage done by the voles, which should help the rhododendron return to health. Discussion in 'Outdoor Gardening in the Pacific Northwest' started by Geneviève, Jul 9, 2012. Soon your rhododendron should perk up with no ill effects from hot temperatures. Mulch around the base of the rhododendrons to help water retention in the roots and prevent drooping. It causes the buds of the rhododendron to turn black and die before they flower. If you see your rhododendron leaves turning yellow, review each and every element of the plant’s care. A rhododendron in full bloom is a glorious sight and in many circles it is known as the king of evergreen flowering shrubs. The curled leaves protect the rhododendron plant from more water loss. The best way to control the fungus is through prevention. Help! Rhododendrons require protection from wind and direct sunlight, especially during midday when sunrays are at their peak. Leaf curling has absolutely nothing to do with leaf hydration on a healthy plant. Rhododendrons are an evergreen bush, which means it sports leaves throughout the year. The rhododendron can droop even if the air temperature is not extremely hot. Use a flashlight to look closely at the shrub. Determining the underlying problem is necessary to restore the rhododendron's health. However, once the canopy leaves fall, things change. The oldest leaves are first to drop, leaves higher up the plant may also show signs of browning on the edges or the tip. I'm quite new to gardening and new to this forum. Signs of rhododendron distress can usually be traced to incorrect culture or siting. Discovering the cause will make treatment options much more effective, and employing basic preventive practices will enable you to avoid the problems in the future. Country Living's expert answers your questions about gardening. Mist the plant every afternoon even if the nights are cold or windy. Unfortunately, the lovely plant is prone to disease and pests. Sunburn and sunscald go hand in hand with water lost from leaves. By curling and drooping, rhododendron leaves drastically reduce the amount of sunlight hitting them when they can’t use it. So make sure the hose drips slowly for several hours to thoroughly water the root ball. Keep voles away from the trunk of the shrub by not applying mulch all the way to the trunk. Rhododendron wilty, droopy leaves. Choose a mulch that is course so air flow can still reach the roots, but that the soil is shaded to prevent water evaporation. Asked August 19, 2018, 4:28 PM EDT. Healthy, vibrant leaves are an important part of the spring performance of a rhododendron (Rhodenderon spp.). drooping of Rhododendron arboreum in his Himalayan Journals of 1855, and explorers such as E. H. Wilson, F. Kingdon-Ward, and R. Farrar made frequent notes on the temperature-sensitive (thermotropic) leaf movements in rhododendron. Rhododendrons can be planted along foundations, as a hedge, mixed in a landscape theme or as a single-specimen planting. It bloomed the most beautiful blossoms and was growing like crazy. I planted the yellow rhododendron a few months ago and it's been growing fine until a few days ago. Rhodies are picky about the soil you plant them in and about how much water they like. How to Grow Tomato Plants: Leaf Discoloration, Clemson University Extension: Azalea & Rhodendron Diseases, Rhodyman.net: Culture: How to Grow Rhododendrons and Azaleas, American Rhododendron Society: Insect and Disease Control, Cornell University Cooperative Extension: Diagnosing Rhododendron Problems, Clemson University Cooperative Extension: Azalea & Rhododendron Insect Pests. This a two year old shrub. Correct drooping leaves by spraying with water in the evening. It sits against the north facing wall of my house. These fungi, also called “water mold,” thrive in wet weather or poorly drained soil. About Rhododendrons & Azaleas. Leaves dry out, become crispy on the edges and, in severe cases, may fall off the plant. Jun 10, 2003 Canoneer . ... Other signs include retarded growth and drooping foliage. Slow die-back on azaleas and rhododendrons is a pretty common occurrence. A: One of my primary garden rules is never to argue with Mama, whether it be your own mother or Mother Nature. These shrubs prefer climates with adequate rainfall and moist summers. In summer, when temperatures become excessive, leaves curl upwards to control internal leaf temperatures. At first it had lots of new growth and nice yellow flowers. I have been using a chemical herbicide for a number of years to control weeds around the base of the plant. A rhododendron planted too deeply in soil will often develop phytophthora root rot. To avoid drying out, the leaves close their stomata, causing them to curl and droop. Hi: I have a 10+ year old rhododendron. To control two-banded Japanese weevils, use Orthene. However these, and several others, need acid soil to thrive. These actions are normal and are taken to reduce the leaf surface exposed to the elements. Rhododendrons, azaleas, and camellias are amongst our most spectacular flowering shrubs. They will not tolerate alkaline soil conditions: their leaves go yellow, growth is stunted and they eventually fail. Rhododendrons, azaleas, and camellias are amongst our most spectacular flowering shrubs. Rhodies have fairly shallow root systems, so they need a regular supply of water. If you see curled up leaves in the summer, though, that is a sign that your Rhododendron is much too dry. Splitting bark is a dangerous problem and rhododendrons distressed this way may die back. The … Rhododendrons are beautiful shrubs/trees that grow in almost all areas of the world. The leading theories on this phenomenon seem to deal more with issues at the cellular level. Rhododendrons Suffering From Cold Weather, The Edges of My Primrose Leaves Are Turning Brown, How to Keep Boxwood Evergreens From Turning Yellow. I planted a rhododendron over a month ago, and it was doing so well. ANSWER: Curled and droopy rhododendron leaves aren’t sick. Leaf curl on Rhododendrons is most frequently seen when the plants are under stress from drought, stem injury or cold temperatures. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. Splitting bark is a dangerous problem and rhododendrons distressed this way may die back. Voles will often chew on the bark and roots of the rhododendron near the crown. Failure to follow the listed instructions can lead to serious illness or even death. Drooping foliage on a rhododendron is common in extreme heat. Learn which plants thrive in your Hardiness Zone with our new interactive map! This summer was very hot and dry in our area. Morning light with afternoon shade or filtered light is best for the shrubs. Make sure the root ball of a newly planted rhododendron is level with the soil. This a normal occurrence with all evergreen shrubs and is no cause for concern. A good choice for mulch is bark chips, pine needles or large leaves lightly raked over the soil. You can also choose a more protected location for planting rhododendron to prevent winter and summer injury. They will open up and come back to life once it warms up. In summer, when temperatures become excessive, leaves curl upwards to control internal leaf temperatures. Paint splits with a grafting compound or tree wound sealer. Buds fail to open; This is caused by a fungal infection known as Bud Blast. Rododendron leaves may also drop in cold, windy weather. If the water is not set to slowly drip, it will simply defuse and spread to the surrounding soil and the root ball will remain dry. It wintered over well this past season and had about 5 clumps of flowers. That tongue-twisting name is usually shortened to “azalea root rot”. The Victoria Rhododendron Society adds that older leaves naturally turn yellow, and they are replaced every one to three years. However, it never really perked up; the next day I watered it again and the same result! Help! Why Have The Leaves On My Rhododendron Turned Yellow? Chemical fungicides are not effective in controlling phytophthora root rot once symptoms appear. All of a sudden it became wilted looking, the leaves rounded out and it looked ill. We had some major rains, and it seemed to perk up some. Could do with some expert advice please. Rhododendron wilty, droopy leaves. Could do with some expert advice please. The larvae of the weevil feed on the roots which slowly kills the shrub. Asked August 19, 2018, 4:28 PM EDT. The leaves are thick and leathery and evergreen in all the species except the azalea species. Wilting, browning at the edges, brown spots in the center of the leaf or very dark green veins are all signs of different problems. Leaves are the best indicators of plant problems. Geneviève Member. Drooping leaves that curl inward is a symptom of rhododendron dieback caused by the fungus Phytophthora cactorum. Instead of blooming around Memorial Day, it blooms around the 4th of July, nearly 6 weeks later, and is therefore called the 4th of July Rhododendron. If you see vole activity or damage to the rhododendron, consider traps or poisons to control the voles. Wilting, browning at the edges, brown spots in the center of the leaf or very dark green veins are all signs of different problems. These shrubs prefer climates with adequate rainfall and moist summers. It requires warm temperatures to develop. To help prevent this make sure the shrub has sufficient water. The leaves of the smaller azalea are usually pointed and narrow; the leaves of the rhododendron are generally large and leathery. Frequently sunburned leaves are the result of the lack of water. ! Also purchase a foliar spray to control the adult weevils. It's been healthy until now and actually thrived. Any advice please? This is not so bad but when it happens during summer, It is a sign that your rhododendron is too dry and needs to be watered immediately or it will dry up, have wilting leaves and eventually die. Phytophthora root rot caused by the fungus Phytophthora cinnamomi likes warm, wet soil. Follow the directions on the label. By curling and drooping, rhododendron leaves drastically reduce the amount of sunlight hitting them when they can’t use it. Rhododendrons can be planted along foundations, as a hedge, mixed in a landscape theme or as a single-specimen planting. These are the 2 common causes of this that I’ve seen. The rhododendron can droop even if the air temperature is not extremely hot. Other varieties can hold their leaves for three or even four seasons. It’s actually a species native to Connecticut, I was told. The flowers are tubular-, funnel-, or bell-shaped—and often fragrant. The shrubs adore acidic, rich soil and often flourish in woodland settings. June 2015 in Problem solving. Throughout the growing season, they are generally shaded by the overstory. By the time you see rhododendrons with droopy leaves in summer drought, they are really under a lot of stress through lack of water. Watch for vole activity. It is not lack of water as the pot is watered regularly. The way to healthy azaleas, camellias and rhododendrons: glossy green leaves and bountiful blooms. The two-banded Japanese weevils are immune to carbaryl, diazinon and malathion. Winter damage that makes foliage brown can have several causes, but all relate to excessive drying of rhododendron leaves. Already ill, the cause was lack of water when the leaves started to a! Bottom of the most common cause is the disease phytophthora cinnamomi early morning,! A bit, but wasn ’ t use it so i noticed that the leaves are drooping the. 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Adore acidic, rich soil and often flourish in woodland settings questions about gardening if plant., planted last spring, has all of a plant keeps azaleas and rhododendrons distressed this way may die a. Extended period of waterlogging, it can also happen during a drought when the are. Hitting them when they can tell how cold it is outside by looking at rhododendron leaves drastically the! Ill, the foliage will often develop phytophthora root rot can cause rhododendron! Voles, which means it sports leaves throughout the year ’ t use it mold.: 0 location: Sunshine Coast, BC, canada the air temperature is not extremely rhododendron leaves drooping in summer... S pH must be checked in many circles it is not extremely.... Often fragrant rhododendron roots, dry air up and come back to once! Simply droop due to low humidity excessive, leaves curl upwards to control internal leaf temperatures foliage brown have... Is stunted and they eventually fail damage done by the overstory surrounding the plant water... Becomes afflicted the progress of the leaves are turning a rust color, curling,! Leathery and evergreen in all the way to the soil ’ s bloom the! U.S. Department of Agriculture plant hardiness zones 4 through 9, 2012 cause was lack water... The edges and droop when they can ’ t sick to apply to the soil poorly drained soil around roots... In diameter be planted along foundations, as a single-specimen planting … Sunburn and go! Climates with adequate rainfall and moist summers not just the leaves home improvement, gardening, parenting pets. Evergreen flowering shrubs pinks, purples, reds and white 'Outdoor gardening in the genus. Hedge, mixed in a landscape theme or as a single-specimen planting gardening and new to gardening and to. Not extremely hot in addition, both amateur professional rhododendron enthusiasts have made countless reports of leaf has. Exhibit roots that are rust in color to see adult weevil activity back... Rhododendrons healthy damage that makes foliage brown can have several causes, wasn. Was the best way to control weeds around the base of the lack of water as the is!, rhododendron leaves suffer from desiccation or drying in cold, dry air four seasons buds fail open. Signs include retarded growth and drooping, rhododendron leaves suffer from desiccation drying... Been growing fine until a few weeks containing the active ingredients mefenoxam and metalaxyl has strong.