Leaves are the best indicators of plant problems. These plants are therefore more susceptible to winter leaf burn because the sun reflecting off the snow reaches foliage that is not usually exposed to such intense light, resulting in a light to medium browning of their leaves, especially on the south facing side. Best offers for your Garden - https://amzn.to/2InnD0w ----- I Have Curled Leaves on My Rhododendron. The shrub is about three years old. Levittown, NY. Rhodies are picky about the soil you plant them in and about how much water they like. This may also help them thaw slower after a frost, Upmanyu says. 0. That radiation can damage the leaves. These shrubs take up too much calcium and not enough iron in alkaline soils. Rhododendrons can be planted along foundations, as a hedge, mixed … If your soil is alkaline, you've found one reason for rhododendron leaves turning yellow: mineral deficiency causing chlorosis. May 8, 2015 | Gardens. 13 years ago. The shrub prefers the afternoon shade. There are some factors that make the shrub appear dead and you could try the following steps to bring the lifeless rhododendron back to life. Curled Up Leaves. Troubleshoot your rhododendron by taking a small cutting to a local Master Gardener for a diagnosis. The curling of the rhododendron leaves is an example of thermotropic movement, or movement in response to temperature. Rhododendron leaves will often curl and droop in response to cold weather. The leaves on my PJM rhododendron are turning yellow/red (see picture). Researchers found that rhododendron leaves … Brown Rhododendron Leaves. The rhododendron did receive waterings when the leaves started to look a bit limp. The leaves are curling lengthwise and it has been an exceedingly dry and hot summer. Vitax Azalea, Rhododendron and Shrub Fertiliser. It registered pretty neutral at around 7. I'm not sure what is causing this or what (if anything) I should do to about it. 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. This may also help them thaw slower after a frost, Upmanyu says. 1 – Nutrient Deficiency . If you have evergreen rhododendrons and live in an area where it gets cold in the winter, you may see the leaves curl up and look pretty unhappy during a cold spell. I planted 4 rhododendrons about this time last year. Rhododendron are often planted in afternoon shade so hot summer sun won’t burn the leaves. CAUSE: Heat stress causes rapid evaporation, so plants curl up to conserve moisture. So there is a chance that your tough rhododendron may recover. If the leaves thaw and uncurl too quickly, frost needles could puncture and damage the surface of the leaves. Yellow rhododendron leaves often represent the plant’s expression of dissatisfaction with its care. By curling and drooping, rhododendron leaves drastically reduce the amount of sunlight hitting them when they can’t use it. 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. Sometimes you notice a few dead branches, yellow or dried out leaves and wonder if the rhododendron is dead. What are rhododendron diseases? Rhododendrons are an evergreen bush, which means it sports leaves throughout the year. Wilting, browning at the edges, brown spots in the center of the leaf or very dark green veins are all signs of different problems. Have what was a beautifully thriving rhododendron { PJM } that suddenly looks as it... 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