If your soil is alkaline, you've found one reason for rhododendron leaves turning yellow: mineral deficiency causing chlorosis. These shrubs take up too much calcium and not enough iron in alkaline soils. Hi: I have a 10+ year old rhododendron. The rhododendron did receive waterings when the leaves started to look a bit limp. Trees. They sometimes contain numerous small, black fruiting bodies … Likewise, why are the leaves on my rhododendron turning yellow? My soil is quite sandy and drains well so when I planted I mixed up a bunch of compost with some top soil. They will open up and come back to life once it warms up. Researchers found that rhododendron leaves … I'm not sure what is causing this or what (if anything) I should do to about it. Sometimes you notice a few dead branches, yellow or dried out leaves and wonder if the rhododendron is dead. Changing leaf angle in Rhododendron may serve to protect the leaves from damage during the winter. Rhododendron Stem Borer (Oberea myops) Damage caused by the stem borer, which includes wilting terminals and dieback, is similar to the Rhododendron borer. But I started seeing browning of some of the leaves. The leaves are curling lengthwise and it has been an exceedingly dry and hot summer. This is an organic fertiliser which breaks down slowly in the soil releasing all the nutrients your lime hating plants need. Brown Rhododendron Leaves. As far as flowering, it may not normally bloom at a young age and may need 6-7 years to bloom consistently. three4rd. Winter damage is thought to be due to high light hitting the leaves when they are cold. 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. These nutrients are required by the plant to thrive and to maintain the quality blooms. I used one of those inexpensive pH testers to see what my soil was like. One remains so! I’ve just taken a photo of my PJM rhodo because I’ve never seen the leaves this red. The curling of the rhododendron leaves is an example of thermotropic movement, or movement in response to temperature. The significance of leaf curling to Rhododendron plants was studied in this project. Such yellowing can be caused by pollutants too. During long periods of dry weather, windy conditions, or bright sunshine leaves may take on a dry, crispy appearance around the edges. That radiation can damage the leaves. This borer, however, is a longhorned beetle. Unfortunately however, if you see droopy leaves during the growing season, fungal root rot, often from Phytophthera is usually the cause. Some of the yellows, probably most large leaved ones grown locally, need particularly good drainage. I have three rhododendron plants that were planted last spring when they were 1 or 2 years old. Although rhododendron leaves tend to curl during cold weather, it may not always protect them from winter burn. I recently purchased two Rhododendron's in a 15" x12" plastic tub. North Bennington, VT. At first both appeared well. 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. Both have slow release 'pellets' put in by reputable local nursery! I transplanted it early this spring to a full sun location (8+ hours of sun per day). 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. Brown edges, spots on the leaves, toasted stems, curled foliage and wholesale die-back…all of this can be seen in areas … The leaves are just trying to conserve water in the cold, dry air. By curling and drooping, rhododendron leaves drastically reduce the amount of sunlight hitting them when they can't use it. 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. The shrub is remarkably hardy in the right growing conditions. Yellow rhododendron leaves often represent the plant’s expression of dissatisfaction with its care. Curled Up Leaves. During cold stress, leaves curl and droop downward. One of the most common reasons why your plant might suffer is when it is lacking in nutrients. So, without further ado, let’s talk about a few reasons why the rhododendron leaves might turn brown or yellow. 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. This may also help them thaw slower after a frost, Upmanyu says. 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