The significance of leaf curling to Rhododendron plants was studied in this project. Reviewing your rhododendrons' culture may reveal the culprit. As the … Heat or cold stress causes damage to rhododendron leaves. I recently purchased two Rhododendron's in a 15" x12" plastic tub. As far as flowering, it may not normally bloom at a young age and may need 6-7 years to bloom consistently. The curling of the rhododendron leaves is an example of thermotropic movement, or movement in response to temperature. Curled Up Leaves. The leaves on my PJM rhododendron are turning yellow/red (see picture). We have what was a beautifully thriving rhododendron{PJM} that suddenly looks as if it is dying. The shrub has been in this raised bed at least four years, happy and facing west under a Japanese maple, but it is the first summer without what used to be a chokecherry just to the south. If the leaves thaw and uncurl too quickly, frost needles could puncture and damage the surface of the leaves. Adult beetles feed on the underside of leaves on the midvein, causing the leaves to curl. This condition is caused by non availability of micronutrients, that are necessary for the healthy growth of these plants. Unfortunately however, if you see droopy leaves during the growing season, fungal root rot, often from Phytophthera is usually the cause. Rhododendron Leaves Curling and Turning Yellow and Orange - Knowledgebase Question. I’m wondering if it’s a nitrogen or a heat thing. First, take a look at how well your soil drains. By curling and drooping, rhododendron leaves drastically reduce the amount of sunlight hitting them when they can’t use it. Vitax Azalea, Rhododendron and Shrub Fertiliser. This may also help them thaw slower after a frost, Upmanyu says. This borer, however, is a longhorned beetle. The shrub is remarkably hardy in the right growing conditions. 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 take up too much calcium and not enough iron in alkaline soils. Hi: I have a 10+ year old rhododendron. If the leaves thaw and uncurl too quickly, frost needles could puncture and damage the surface of the leaves. Rhododendron are often planted in afternoon shade so hot summer sun won’t burn the leaves. Rhodies are picky about the soil you plant them in and about how much water they like. But I started seeing browning of some of the leaves. Troubleshoot your rhododendron by taking a small cutting to a local Master Gardener for a diagnosis. This is called leaf scorch, and depending on the severity, the leaves may drop prematurely. Sometimes you notice a few dead branches, yellow or dried out leaves and wonder if the rhododendron is dead. What can be happening to it all of a sudden? Yellow rhododendron leaves often represent the plant’s expression of dissatisfaction with its care. Wondering if it may be normal for a plant that has suffered a little stress, some rhodos drop some of their one year old leaves as new leaves develop. Best offers for your Garden - https://amzn.to/2InnD0w ----- I Have Curled Leaves on My Rhododendron. Brown edges, spots on the leaves, toasted stems, curled foliage and wholesale die-back…all of this can be seen in areas … Question by NEWMONTER August 9, 1998. To diagnose the problem first check the roots. Likewise, why are the leaves on my rhododendron turning yellow? 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. Answer from NGA August 9, 1998. The rhododendron is an amazingly beautiful flowering plant to grow in the garden. This treatment is ideal after flowering. For the first couple of years, it was totally ignored. My rhododendron is a couple of years old. The rhododendron did receive waterings when the leaves started to look a bit limp. Both have slow release 'pellets' put in by reputable local nursery! Asked August 30, 2016, 3:27 PM EDT. Rhododendron leaves will often curl and droop in response to cold weather. The leaves are curling lengthwise and it has been an exceedingly dry and hot summer. They weren't covered through the winter (just well-mulched), so I thought that maybe it could be winter-injury related. Rhododendron Stem Borer (Oberea myops) Damage caused by the stem borer, which includes wilting terminals and dieback, is similar to the Rhododendron borer. Levittown, NY. Your rhododendron leaves are turning brown because they may be suffering from scorched leaves. So, without further ado, let’s talk about a few reasons why the rhododendron leaves might turn brown or yellow. Question by Mufasa345919 August 19, 2002. The shrub prefers the afternoon shade. I'm not sure what is causing this or what (if anything) I should do to about it. One remains so! Keeping the soil moist when the plants are in growth is essential. It’s in the spring, when many plants are breaking dormancy and putting on new growth more rapidly than we can imagine possible, that we finally see the damage that winter has done to our Rhododendron shrubs. This could happen due to the hot sun or cold winter winds. When brown leaves show up in a rhododendron, it's usually at winter's end -- right before flowering time. CAUSE: Heat stress causes rapid evaporation, so plants curl up to conserve moisture. We have been soaking it everyday since noticing the chage in the leaves … 0. 13 years ago. The latter is the result of a soil fungus. I wanted to know what is the problem and how I could fix it. This year, in August, the leaves have started to curl and change color - yellow and orange. Yellow rhododendron leaves. The most common specific fungal diseases that affect rhododendrons include; ... the leaves become very pale, swollen and distorted, then covered in a bloom of white fungus spores; Leaf spots: Purple or brown, more or less round spots appear on the upper leaf surfaces, usually of evergreen species. The leaves are just trying to conserve water in the cold, dry air. This may also help them thaw slower after a frost, Upmanyu says. Advice would be greatly appreciated! three4rd. I have three rhododendron plants that were planted last spring when they were 1 or 2 years old. What Are Your Plants Trying To Tell You?There are a Lot of articles on internet with various solutions to the problem of leaf curling. Rhododendrons are bushy and approximately 15" tall. These nutrients are required by the plant to thrive and to maintain the quality blooms. One of the most common reasons why your plant might suffer is when it is lacking in nutrients. I used one of those inexpensive pH testers to see what my soil was like. If your soil is alkaline, you've found one reason for rhododendron leaves turning yellow: mineral deficiency causing chlorosis. That radiation can damage the leaves. Although rhododendron leaves tend to curl during cold weather, it may not always protect them from winter burn. Winter damage that makes foliage brown can have several causes, but all relate to excessive drying of rhododendron leaves. Step 1 Make sure that the rhododendron is in the right location. Original post from December 16, 2008 follows) As temperatures have plunged into the 20s (or lower) and we’ve bundled up and watched the snow fall from our heated indoor perches, garden plants are left to fend for themselves day and night under blankets of ice and snow and amid desiccating winter winds. The plants use a lot of nutrients to produce a spectacular floral display. Rhododendron leaves will curl inward and droop. 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