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. However these, and several others, need acid soil to thrive. Advice would be greatly appreciated! Older leaves turn yellow to pale green. Why is my Rhododendron turning yellow? The hardy leaves of the rhododendron can lose their lovely appearance due to several diseases attacking the garden favorite. I attached the photos of the fallen yellow leaves. The shrub gets through the winter quite well and comes back every year; it also handles replanting very well. Soil too alkaline. Chlorotic leaves are usually a sign of iron deficiency and can be dealt with by using iron sequestrene, according to the Millais Nurseries. Slow, stunted growth Remedy: Fertilise with Butlers Azalea, Camellia and Rhododendron food in late spring after flower finishes and just before new growth starts . When grown on the right soil, or in pots using the right compost they can suffer from yellowing leaves if watered with hard tap water, or just when the right nutrients are exhausted. 44% Upvoted. Why is my Rhododendron turning yellow? How does leaf of butterfly orchid become yellow to do, how to return a responsibility? And they wont grow in areas with chalky/limey soil unless in raised beds. Answer from NGA August 9, 1998 . The latter is the result of a soil fungus. I planted 4 rhododendrons about this time last year. Chlorosis is also caused by poor conditions, such as drought, soil pH or drainage problems. The higher the soil's pH is, the less iron is available to the plants. Over-fertilizing must be avoided, as the edge of the leaf will likely turn dry and brown. The Rhododendron genus is a hugely diverse group of plants that includes closely related azaleas. Treat rhododendrons for rust diseases by raking away infected leaves, pruning off diseased leaves, twigs and branches, and then destroying or discarding the infected plant parts. conditions: their leaves go yellow, growth is stunted and they eventually fail. The leaves on my PJM rhododendron are turning yellow/red (see picture). Yellow leaves are usually caused by improper maintenance. Rhododendrons (including deciduous azaleas) may be attacked by several diseases, causing unsightly foliage or a lack of flowers. The plant is about 7 feet tall and 6 feet in diameter. Right before the leaves fall off the plant, they will turn yellow. Veins stay green as yellow moves from the leaf center out. Rhododendrons do not survive well in wet soil and this can result in yellow discolouration. If your bush exhibits these symptoms, examine the leaves thoroughly. Now i noticed its leaves are turning yellow. What if the leaves dry up. My two Holly bushes leaves are turning yellow and dropping. Reasons include: because they are too wet, too dry, planted too deep, starved (needing feeding), soil too alkaline, or so il is compacted: Why does my rhododendron with yellow or chlorotic leaves: This is a general sign of unhappiness and can have many causes: Once a section becomes afflicted the progress of the affliction spreads rapidly. If your Rhododendron leaves are turning yellow especially around the veins, you need to check first and foremost for proper drainage. What can be happening to it all of a sudden? 0. Rhododendrons are a beauty in the yard with their bright bold clusters of flowers in the spring. 8 comments. In general, a young shrub needs regular watering until it has a well-developed root system that can effectively search for moisture. A COVID-19 Prophecy: Did Nostradamus Have a Prediction About This Apocalyptic Year? Symptoms: Decline in vigour and leaves turn yellow … Dear OSU Extention experts, I planted a PJM rhododendron this spring. 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