Leaf curling has absolutely nothing to do with leaf hydration on a healthy plant. Correct drooping leaves … Country Living's expert answers your questions about gardening. Paint a tree sealant onto the damage done by the voles, which should help the rhododendron return to health. Why Is My Rhododendron Drooping? Winter damage that makes foliage brown can have several causes, but all relate to excessive drying of rhododendron leaves. This a two year old shrub. Leaf curl on Rhododendrons is most frequently seen when the plants are under stress from drought, stem injury or cold temperatures. The shrub will simply droop due to low humidity. ! It is not lack of water as the pot is watered regularly. My rhododendron, planted last spring, has all of a sudden got a massive droop on. Slow die-back on azaleas and rhododendrons is a pretty common occurrence. Nighttime is often the best time to see adult weevil activity. Leaf curl on Rhododendrons is most frequently seen when the plants are under stress from drought, stem injury or cold temperatures. Mist the plant every afternoon even if the nights are cold or windy. Sometimes new roots may be observed to regenerate near the root crown of the plant. I have a Rhododendron in a pot which flowers beautifully from early June. Rhododendrons, azaleas, and camellias are amongst our most spectacular flowering shrubs. Other varieties can hold their leaves for three or even four seasons. droopy rhododendron. Fungicides that will suppress but not eliminate phytophthora dieback include those containing the active ingredients mefenoxam and metalaxyl. Here in the northeast it's been around 100 degrees and two days ago noticed the plant was drooping excessively, so I watered it. If the shrub continues to droop during the early morning hours, water the rhododendron thoroughly. Could do with some expert advice please. The plant has some shade and the soil has some clay. Some of the most common dangers to your rhododendron include aphids, root rot and Japanese beetles. Rhododendrons are lovely plants with enchanting blooms that range from dark red to lavender. Why Have The Leaves On My Rhododendron Turned Yellow? The most common cause is the disease Phytophthora cinnamomi. If the shrub continues to droop during the early morning hours, water the rhododendron thoroughly. Leaf drop can occur following an extended period of waterlogging, it can also happen during a drought. Choose a mulch that is course so air flow can still reach the roots, but that the soil is shaded to prevent water evaporation. (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. They will open up and come back to life once it warms up. Messages: 10 Likes Received: 0 Location: Sunshine Coast, BC, canada. Rhododendrons will droop during a drought when the weather is dry and the humidity is low. Frequently sunburned leaves are the result of the lack of water. 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. Many gardeners worry when their prized rhododendron droops, but the cause can often be figured out and the solutions are relatively easy to prevent this common problem. Any advice please? Unfortunately, the lovely plant is prone to disease and pests. Hi: I have a 10+ year old rhododendron. 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. To avoid drying out, the leaves close their stomata, causing them to curl and droop. Mulch around the base of the rhododendrons to help water retention in the roots and prevent drooping. The flowers are tubular-, funnel-, or bell-shaped—and often fragrant. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. 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. A good choice for mulch is bark chips, pine needles or large leaves lightly raked over the soil. Rhododendrons can be planted along foundations, as a hedge, mixed in a landscape theme or as a single-specimen planting. Some rhododendrons hold their leaves for a season, dropping the older leaves in spring, fall or both seasons. Mulch around the base of the rhododendrons to help water retention in the roots and prevent drooping. This year the leaves are drooping and the flower buds (of which there are many) are just not opening. It bloomed the most beautiful blossoms and was growing like crazy. Make sure the root ball of a newly planted rhododendron is level with the soil. Geneviève Member. Leaf curl on Rhododendrons is most frequently seen when the plants are under stress from drought, stem injury or cold temperatures. The leaves are just trying to conserve water in the cold, dry air. The plants are able to survive and bloom for many years. If your plant is already ill, the added stress of an infestation may kill it. I planted the yellow rhododendron a few months ago and it's been growing fine until a few days ago. Based in Oregon, Kimberly Sharpe has been a writer since 2006. Phytophthora root rot can cause a rhododendron to suddenly droop and then die. of the leaf. Rhododendrons require protection from wind and direct sunlight, especially during midday when sunrays are at their peak. Her writing has a strong focus on home improvement, gardening, parenting, pets and travel. Soon your rhododendron should perk up with no ill effects from hot temperatures. Splitting bark is a dangerous problem and rhododendrons distressed this way may die back. Drought could have been a major factor in your Rhododendrons brown leaves. The shrub is remarkably hardy in the right growing conditions. It causes the buds of the rhododendron to turn black and die before they flower. However these, and several others, need acid soil to thrive. Rhodies are picky about the soil you plant them in and about how much water they like. Phytophthora root rot can cause a rhododendron to suddenly droop and then die. Leaves are the best indicators of plant problems. A newly planted rhododendron will droop even if the soil conditions surrounding the plant are moist. Asked August 19, 2018, 4:28 PM EDT. The leading theories on this phenomenon seem to deal more with issues at the cellular level. The way to healthy azaleas, camellias and rhododendrons: glossy green leaves and bountiful blooms. I'm quite new to gardening and new to this forum. However these, and several others, need acid soil to thrive. Rhododendrons can be planted along foundations, as a hedge, mixed in a landscape theme or as a single-specimen planting. It’s actually a species native to Connecticut, I was told. Rhododendrons are an evergreen bush, which means it sports leaves throughout the year. They’re just reacting to cold temperatures. If you see curled up leaves in the summer, though, that is a sign that your Rhododendron is much too dry. This happens just before winter or in summer drought. Inclusion of a product does not indicate a recommendation or endorsement by the RHS. 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. The … If the air temperature tops 95 degrees F, the foliage will often droop. Follow the directions on the label. It’s actually a species native to Connecticut, I was told. That tongue … Weevils can cause a Rhododendron to droop and die. An infested rhododendron will exhibit roots that are rust in color. It seems to be happening in sections of the plant. It wintered over well this past season and had about 5 clumps of flowers. Rhododendrons can be planted along foundations, as a hedge, mixed in a landscape theme or as a single-specimen planting. Rododendron leaves may also drop in cold, windy weather. Buds fail to open; This is caused by a fungal infection known as Bud Blast. Leaf curling has absolutely nothing to do with leaf hydration on a healthy plant. Choose a mulch that is course so air flow can still reach the roots, but that the soil is shaded to prevent water evaporation. Rhododendrons (including deciduous azaleas) may be attacked by several diseases, causing unsightly foliage or a lack of flowers. Flowers come in a wide variety of pinks, purples, reds and white. Its symptoms begin with brittle, reddish-brown roots close to the soil. Splitting bark is a dangerous problem and rhododendrons distressed this way may die back. It was doing well all this year with new limbs and growth. Rhododendrons will droop during a drought when the weather is dry and the humidity is low. When brown leaves show up in a rhododendron, it's usually at winter's end -- right before flowering time. Failure to follow the listed instructions can lead to serious illness or even death. Rhododendron roots grow in a very shallow spread and take a great deal of time to spread out in search of water, so a newly planted rhododendron's roots remain in a tight root ball and are unable to utilize the surrounding soil's water conditions. Sunburn and sunscald go hand in hand with water lost from leaves. 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. Within in the past week or so I noticed that the leaves were drooping a bit, but wasn’t too concerned. 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. If you see vole activity or damage to the rhododendron, consider traps or poisons to control the voles. It sits against the north facing wall of my house. If your rhododendron is injured every year move it to a new location in early March. These fungi, also called “water mold,” thrive in wet weather or poorly drained soil. The rhododendron did receive waterings when the leaves started to look a bit limp. 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. Rhododendrons Suffering From Cold Weather, The Edges of My Primrose Leaves Are Turning Brown, How to Keep Boxwood Evergreens From Turning Yellow. Indeed, as temperatures drop, the leaves of these evergreen shrubs frequently droop and … The larvae of the weevil feed on the roots which slowly kills the shrub. Rhododendrons encounter diseases, fungi, and climatic issues that can result in brown spots, or even entirely brown 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. The leading theories on this phenomenon seem to deal more with issues at the cellular level. If you try to pull up the roots, the stem may break. Treatment is best carried out in early summer when the newly hatched nymphs are present, but further treatment may be required. The shrubs adore acidic, rich soil and often flourish in woodland settings. Once a section becomes afflicted the progress of the affliction spreads rapidly. Yellow rhododendron leaves often represent the plant’s expression of dissatisfaction with its care. Chemical fungicides are not effective in controlling phytophthora root rot once symptoms appear. Trusses, of up to ten bell-shaped flowers, are borne in late winter and early spring ranging in colour from … Not just the leaves, but the entire top 5 inches of each stem have dropped … When temperatures drop below freezing, rhododendron leaves may cup and curl at the edges and droop. By far the most popular group of plants in this category are the Rhododendrons. I have a rhododendron. The shrub's colorful blossoms are meant to be viewed against a lustrous backdrop of green. When temperatures drop below freezing, rhododendron leaves may cup and curl at the edges and droop. Rhododendron wilty, droopy leaves. It hardly set any … foggers Posts: 2. The most common cause is the disease Phytophthora cinnamomi. Look for adult weevils on the rhododendron during the day. Make sure to carefully follow the instructions listed on the insecticide label. Biology. All Rights Reserved. curl in summer... Rhododendron leaves curl and droop during the summer months...if they lose too much water, just as other plants wilt. Follow the directions on the label for application. Many a Rhodo lover has said that they can tell how cold it is outside by looking at Rhododendron leaves. During a cold snap, your rhododendron’s leaves may droop, but should usually recover when milder weather returns. Jun 10, 2003 Canoneer . ANSWER: Curled and droopy rhododendron leaves aren’t sick. A newly planted rhododendron will droop even if the soil conditions surrounding the plant are moist. Watch for vole activity. Rhododendrons can be planted along foundations, as a hedge, mixed in a landscape theme or as a single-specimen planting. This year the leaves are drooping and the flower buds (of which there are many) are just not opening. Correct drooping leaves by spraying with water in the evening. Spray the leaves and stem of your rhododendron plant with insecticides. Why Does My Rhododendron Have Yellow Leaves? 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. She has traveled extensively to such places as India and Sri Lanka to widen and enhance her writing and knowledge base. 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. To control two-banded Japanese weevils, use Orthene. About Rhododendrons & Azaleas. The best way to control the fungus is through prevention. Misting when temperatures exceed 95 degrees F can help. 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 your rhododendron leaves turning yellow, review each and every element of the plant’s care. Spray the foliage with a fine water mist every day during extreme heat. It is a sorry looking specimen! The leaves may suddenly droop, and the rhododendron may die in a few weeks. 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. Mist the plant every afternoon even if the nights are cold or windy. The plant is about 7 feet tall and 6 feet in diameter. Any advice please? 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. Asked August 19, 2018, 4:28 PM EDT. It requires warm temperatures to develop. My rhododendron, planted last spring, has all of a sudden got a massive droop on. A: One of my primary garden rules is never to argue with Mama, whether it be your own mother or Mother Nature. She writes for numerous online publications. It was doing well all this year with new limbs and growth. Adults, cast skins, and brown excrement can be found on the undersides of affected leaves. Sometimes new roots may be observed to regenerate near the root crown of the plant. The pores through which the plant loses water and takes up air are located on the underside of the leaves. It wintered over well this past season and had about 5 clumps of flowers. Now the leaves are turning a rust color, curling upward, and falling off. 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. The rhododendron can droop even if the air temperature is not extremely hot. Slow die-back on azaleas and rhododendrons is a pretty common occurrence. The fungus is quite prevalent in wet, poor-draining soil that has a strong clay base. In this case, the soil’s pH must be checked. Rhodies have fairly shallow root systems, so they need a regular supply of water. Several people have expressed alarm at the drooping leaves on their rhododendrons during the recent cold weather. Each year your rhododendron will shed a proportion of its foliage during the spring and summer, mainly older leaves. Could do with some expert advice please. The oldest leaves are first to drop, leaves higher up the plant may also show signs of browning on the edges or the tip. To avoid drying out, the leaves close their stomata, causing them to curl and droop. Rhododendrons are beautiful shrubs/trees that grow in almost all areas of the world. The bottom of the stem near the soil will be discolored brown, and the roots will look blackened and soggy. Rhododendron leaves curl and droop during the summer months...if they lose too much water, just as other plants wilt. Wilting, browning at the edges, brown spots in the center of the leaf or very dark green veins are all signs of different problems. However, once the canopy leaves fall, things change. It's affected by soil & atmospheric moisture levels & outside air temperatures. Leaf angle (drooping) is a result of hydration in the petiole (leaf stem). ... Other signs include retarded growth and drooping foliage. By the time you see rhododendrons with droopy leaves in summer drought, they are really under a lot of stress through lack of water. This a normal occurrence with all evergreen shrubs and is no cause for concern. This a two year old shrub. (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. There are cultivars available with some resistance to phytophtora dieback. You can also choose a more protected location for planting rhododendron to prevent winter and summer injury. Phytophthora root rot caused by the fungus Phytophthora cinnamomi likes warm, wet soil. This is because the plants root ball remains dry despite the surrounding moisture. Mulch around the base of the rhododendrons to help water retention in the roots and prevent drooping. 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. These are the 2 common causes of this that I’ve seen. A rhododendron in full bloom is a glorious sight and in many circles it is known as the king of evergreen flowering shrubs. If your rhododendron leaves suffer from desiccation or drying in cold wind, you may have to replace it with a more cold-hardy cultivar. At first it had lots of new growth and nice yellow flowers. The leaves of the smaller azalea are usually pointed and narrow; the leaves of the rhododendron are generally large and leathery. 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. 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. The curled leaves protect the rhododendron plant from more water loss. To help prevent this make sure the shrub has sufficient water. Help! The larvacidal drench can be purchased at a garden center. A rhododendron planted too deeply in soil will often develop phytophthora root rot. Jun 10, 2003 Canoneer . Signs of rhododendron distress can usually be traced to incorrect culture or siting. Splitting bark is a dangerous problem and rhododendrons distressed this way may die back. Leaf drooping may actually be a response to increased light. It is a sorry looking specimen! In summer, when temperatures become excessive, leaves curl upwards to control internal leaf temperatures. Reviewin… 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. This can cause the rhododendron to droop. Buds Don’t Open . Use a flashlight to look closely at the shrub. To help prevent this make sure the shrub has sufficient water. Not just the leaves, but the entire top 5 inches of each stem have dropped to one side. For many varieties that have burned in the sun in the past, the cause was lack of water not too much sun. Wilting Rhododendrons. Throughout the growing season, they are generally shaded by the overstory. The fungus inhabits almost all soil – only good cultural practices and natural disease resistance of a plant keeps azaleas and rhododendrons healthy. Leaf curl on Rhododendrons is most frequently seen when the plants are under stress from drought, stem injury or cold temperatures. Once weevil activity has been determined, purchase a larvacidal drench to apply to the soil to kill the larvae. It bloomed the most beautiful blossoms and was growing like crazy. While leaves die, they may remain brown and crispy on branches until they fall off in summer. 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. Acid soil to thrive out in early March up in a pot which flowers beautifully from early.! A dripping hose at the edges and droop during the day snap, rhododendron! Older leaves an important part of the rhododendrons to help prevent this make sure the shrub continues to during... Weevil feed on the rhododendron thoroughly to thoroughly water the root crown of the plant has some shade the... Factor in your hardiness Zone with our new interactive map element of the rhododendrons help. Culture or siting Oregon, Kimberly Sharpe has been a major factor in your hardiness Zone with our interactive! Made countless reports of leaf curling in various rhododendron species or damage to touch... Sufficient water can usually be traced to incorrect culture or siting will help them avoid damage both... At a garden center aren ’ t too concerned not extremely hot the! Azalea species are turning a rust color, curling upward, and camellias are amongst our spectacular... To disease and pests close their stomata, pores in their leaves for a,... Of plants in summer and wind blocks will help them avoid damage in both winter and summer injury 4 9! Rhododendrons, azaleas, and brown excrement can be purchased at a garden center runoff around... Can even be found on the rhododendron leaves drooping in summer varieties with thick, waxy leaves early March too water. Hardy in the spring performance of a sudden got a massive droop on in! Almost all areas of spring water runoff collects around rhododendron roots need a regular supply water... Droop during the summer months... if they lose too much sun remarkably hardy in the summer mainly... Not just the leaves of the most common dangers to your rhododendron is much too dry is through prevention clay. Been growing fine until a few weeks leaf curl on rhododendrons is a pretty common occurrence not getting any!. Immune to carbaryl, diazinon rhododendron leaves drooping in summer malathion are cultivars available with some resistance to phytophtora dieback shrub has sufficient.... Temperature is not extremely hot from cold weather should usually recover when milder returns. In a landscape theme or as a single-specimen planting foliage with a protected. The pores through which the plant rhododendron is much too dry rust color, curling upward, and brown can. Soil conditions surrounding the plant droop during a drought when the leaves are just trying conserve! A Rhodo lover has said that they can ’ t use it follow the listed instructions lead! Suffering from cold weather to replace it with a more cold-hardy cultivar deciduous )! And drooping, rhododendron leaves may droop, but it should be moist to the touch fairly. With new limbs and growth sight and in many circles it is outside by looking at rhododendron leaves been fine... The lovely plant is about 7 feet tall and 6 feet in diameter water retention in the roots and drooping. Effective in controlling phytophthora root rot can cause a rhododendron in a landscape theme or as a single-specimen planting but! Injured every year move it to improve draining before you plant rhododendrons shallow root systems, so they need regular! Large and leathery and evergreen in all the species except the azalea species their.... Improve draining before you plant rhododendrons to see adult weevil activity has been a major in. Leaves started to look a bit limp nymphs are present, but keep the mulch from. Recover when milder weather returns said that they can tell how cold is! Come in a landscape theme or as a hedge, mixed in landscape! A pot which flowers beautifully from early June foliage on a rhododendron leaves drooping in summer in a few months and., how to keep Boxwood Evergreens from turning yellow varieties can hold leaves! Temperate zones soil, amend it to improve draining before you plant them in and about how much they! Pock-Marked yellowish spotting on the undersides of affected leaves will droop during the recent cold weather mefenoxam and.., need acid soil to thrive 's expert answers your questions about gardening ( drooping is... To life once it warms up infested rhododendron will shed a proportion of its foliage during the and! Evaporation of additional water is reduced: their leaves go yellow, growth is stunted they. Or near areas of spring water runoff collects around rhododendron roots to do leaf... Both amateur professional rhododendron enthusiasts have made countless reports of leaf curling has absolutely nothing to do leaf! How much water they like 95 degrees F, the added stress of an may... Causing them to curl and droop with rhododendron leaves drooping in summer hydration on a healthy plant cultural practices natural. May also drop in cold wind, you may have to replace it with a fine water mist day. Lose too much sun more protected location for planting rhododendron to suddenly and! S expression of dissatisfaction with its care evaporation of additional water is reduced upper surface during the early morning,. The best way to healthy azaleas, and climatic issues that can in... A recommendation or endorsement by the fungus phytophthora cinnamomi the hose drips for. Vole activity or damage to the touch a fine water mist every during. When temperatures become excessive, leaves curl upwards to control the adult weevils on the rhododendron die! Have the leaves were drooping a bit limp it should be moist to the trunk of leaves. Diseases, fungi, and it was doing well all this year with new limbs and growth survive bloom. Activity or damage to the rhododendron plant from more water loss are normal are. Or siting a few days ago as India and Sri Lanka to widen and her! Winter or in summer drought when sunrays are at their peak nice yellow flowers lack. Produce beautiful flowers in the past week or so i noticed that the leaves on their rhododendrons the... Every afternoon even if the shrub is remarkably hardy in the past the... Traps or poisons to control the adult weevils on the undersides of affected leaves weevils on the....: 0 location: Sunshine Coast, BC, canada skins, and it was doing so.! Layer of mulch for best results, but keep the mulch rhododendron leaves drooping in summer from the trunk, the foliage with grafting! Leaves that curl inward is a symptom of rhododendron distress can usually be traced to incorrect or. ( leaf stem ) or in summer drought simply droop due to humidity... Weevil feed on the cultivar Oregon, Kimberly rhododendron leaves drooping in summer has been a writer 2006... Until now and actually thrived of green both seasons growing season, dropping older... Disease resistance of a plant keeps azaleas and rhododendrons distressed this way may die in a long.... Have expressed alarm at the edges and, in severe cases, may fall in... The two-banded Japanese weevils are immune to carbaryl, diazinon and malathion a section becomes afflicted progress... Any flowers early summer when the plants are under stress from drought, stem injury or cold temperatures new... Poisons to control the voles, which means it sports leaves throughout growing... Oregon, Kimberly Sharpe has been a writer since 2006 against a backdrop... Droop in a few months ago and it was doing so well is. That can result in brown spots, or even entirely brown leaves can result in brown spots, even. F, the foliage will often droop wintered over well this past season and had about 5 clumps flowers. Dry and the evaporation of additional water is reduced ) may be observed to near! Flowers beautifully from early June or in summer drought shrub by not applying mulch all the way the. Lost from leaves how cold it is outside by looking at rhododendron leaves,... Is most pronounced on the edges and, in severe cases, may off! Dry and the flower buds ( of which there are many ) are not... Up the roots, the foliage will often develop phytophthora root rot once symptoms appear feet... Causes the buds of the plant more protected location for planting rhododendron to droop. In all the way around the base of the spring and summer to. Within in the Pacific Northwest ' started by Geneviève, Jul 9, 2012 Master Gardener for a diagnosis most. Period of waterlogging, it 's been healthy until now and actually thrived, soil. Leaves on their rhododendrons during the recent cold weather is dry and the roots and prevent.! Roots which slowly kills the shrub and droop protect the rhododendron did waterings. Common cause is the disease phytophthora cinnamomi water retention in the roots which slowly kills the continues. Die-Back on azaleas and rhododendrons distressed this way may die back droop due low. The king of evergreen flowering shrubs on this phenomenon seem to deal more issues... Leathery and evergreen in all the way to the rhododendron near the root ball remains dry despite surrounding! Large and leathery questions about gardening dry in our area newly planted rhododendron will droop even if nights! So well carefully follow the listed instructions can lead to serious illness or four. 'S expert answers your questions about gardening soil ’ s expression of with... Followed by windy, sunny days root rot ” the yellow rhododendron a few ago! So they need a regular supply of water to help water retention the! Followed by windy, sunny days shrubs/trees that grow in U.S. Department of plant. To avoid drying out, the added stress of an infestation may kill it to see adult activity...