Mine don't. var pid = mySplit[1]; e.preventDefault(); } Use these convenient icons to share this page on various social media platforms: You must be signed in before you can post questions or answers. The browning, cupping and sectioning also suggests possible herbicide poisoning. This is especially a problem if too much is applied at one time or if the amount applied is compounded by residue from the previous year. Anything that dehydrates roots and plant tissues can lead to red leaves. Lack of water or food may also cause leaves turning yellow on rhododendron. function Frog_Reply(pid) { These include late freezes, drought, virus and disease, mites and insects. }); The alkalinity prevents the plant from taking in the iron that it needs to remain healthy. The best way to determine if the problem is a virus or disease is to take fresh samples to your local extension service along with photos and they will be able to advise you. When the soil around the base of a shrub is treated with an herbicide, it can be absorbed by the plant roots. In autumn, the leaves of sourwood, sumacs, dogwoods, and some maples often turn red or purple like the Brandywine Maple. I am in zone 4/5 so we do get foliage colors on other bushes, trees, etc. If the same symptom appears in new leaves, then it is likely that the soil is too alkaline. } Now the leaves are turning a rust color, curling upward, and falling off. $(document).ready(function(){ $("#"+thisid).html(foo); $("#show_answer_button").hide(); if ($(window).width() < 1025) { Why does my rhododendron with yellow or chlorotic leaves: This is a general sign of unhappiness and can have many causes: 1. Here's how to diagnose and correct the problem. You need to do this before the plant starts to suffer as root problems caused by poor drainage can be fatal. I have added sulfur, biomin booster, and fertilizer. Give them plenty of water during periods of drought. Not usually a sign of insufficient iron in the soil, chlorosis is most often a problem with the pH (alkaline or acidity) of the soil. This spring’s bloom was the best in a long time. Privacy Policy and type: "POST", Terms of Service apply. $("#"+thisid).attr('style',''); I have been using a chemical herbicide for a number of years to control weeds around the base of the plant. }); ... On a couple of them the older leaves are turning yellow, then brown and some are falling off. $("form.frog_reply_form").submit(function(e) { The hardy leaves of the rhododendron can lose their lovely appearance due to several diseases attacking the garden favorite. Thanks for any help. 50% of the leaves on them are turning from healthy green to Red. The same red and purple pigments behind similar colors in flowers, fruits and fall foliage show up in plants under stress. The flowers are itty-bitty things in the middle. Always follow the package directions to the letter. } $("#"+thisid).slideDown(); I hope this information helps. Also, if an herbicide is sprayed when temperatures are above 80 degrees F, it can evaporate into a vapor cloud and float up through your shrub causing severe damage or death. Weather is the primary factor for why your maple tree leaves are not turning red in fall. var thisid = $(this).attr('id'); Look for very fine webbing amongst the leaves for mites or in rolled twisted leaves from the larval feeding of the Gall Midge fly, a common pest. Corn with a phosphorus deficiency will have narrow, bluish green leaves that eventually turn reddish purple. $("#replyform-"+pid).slideDown(); data: $("#"+thisid).serialize(), I have a large rhodie myself and can understand your anxiety about losing such a magnificent shrub to pests or disease. } $("#"+thisid).hide(); For a quick fix, you can try spraying the ground and leaves with an iron sulfate * solution. }); « Return to the Garden Knowledgebase Homepage. }); function Frog_Cancel(pid) { Too Much Water Can Cause Curled Rhododendron Leaves Rhododendrons can get root rot if they don’t have well-drained soil; putting one of these shrubs in a wet spot in the garden is always a mistake. One of the interesting things about poinsettias is that the color is actually in modified leaves called bracts, not the flowers. Be the first to have exclusive content and access to our events, P. Allen Smith Fine Gardens & Landscapes (external site), Oliver-Smith Community Conservation Design + Development (external site), Allen's Heritage Poultry Conservancy (external site), Allen's TEDx--Saving a Hungry Planet (external site), Allen's Learn + Grow Corner of the Internet, Allen's Go-To Plant Provider -- Gilbert H. Wild & Son (external site), Allen's #PlantForVictory - Hope & Wellbeing during COVID-19 Project, Weddings at Moss Mountain Farm (external site), P. Allen Smith Fine Garden and Landscape Design, P. Allen Smith Conservation Community Design + Development. In shadier situations, the plant may eventually lose some lower leaves simply due to lack of light, this would be a normal occurrence during the adjustment process. $("#replyform-"+pid).hide(); Once a section becomes afflicted the progress of the affliction spreads rapidly. The safest way to apply an herbicide is to apply it in the morning when temperatures are cool and there is no breeze to cause it to drift into your valued landscape plants. document.write(''); If your rhododendron is planted in a spot that receives direct winter winds, consider building a burlap wind …

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