Rhododendrons are bushy and approximately 15" tall. When the temperature drops below 35°F, rhododendron leaves begin to cup and curl at the edges. I didn't do anything over the winter but mulch it. 1 of 3. It looked pretty tired, and dropped a number of leaves. I recently purchased two Rhododendron's in a 15" x12" plastic tub. Leaf Curl: Rhododendron leaves begin to cup and curl at the edges when temperatures drop to below 35 ºF. Azalea/Rhododendron > Leaves > Curled, cupped, or distorted leaves. Leaf curling in cold weather is a defense against moisture loss through the leaf surface. Non-selective herbicide injury ... Shrubs sprayed during the summer or fall may not have noticeable injury until the following season when leaves appear as stunted, narrow, strap-like, and … This problem is not caused by insects or disease but is a way the plant reduces water loss from its leaves … Summer Heat. At first both appeared well. At 25 ºF, the leaves will be curled very tight and begin to droop. Yellow rhododendron leaves often represent the plant’s expression of dissatisfaction with its care. This summer was very hot and dry in our area. Rhodies are picky about the soil you plant them in and about how much water they like. The second has started to curl it's leaves. When brown leaves show up in a rhododendron, it's usually at winter's end -- right before flowering time. 14 years ago. This is not so bad but when it happens during summer, It is a sign that your rhododendron is too dry and needs to be watered immediately or it will dry up, have wilting leaves and eventually die. Title: Why do Rhododendron Leaves Curl? The rhododendron did receive waterings when the leaves started to look a bit limp. The shrub's colorful blossoms are meant to be viewed against a lustrous backdrop of green. I planted a Rhododendron shrub last spring, it looked nice at the nursery (and was in flower at the time) but it seemed to poop out over the summer. Rhododendron leaves curled and dry looking. Over the past few weeks, however, I notice that while much of the plant looks good (leaves appear normal), parts of the plant just seem to be dying off - leaves curl … Both have slow release 'pellets' put in by reputable local nursery! At 25°F, the leaves have curled so tight that half the leaf surface has disappeared and the leaves droop. Most varieties exposed to unprotected all-day sun are doomed. This happens just before winter or in summer drought. bonitaapplebum. Leaf scorch occurs when a plant receives too little water to compensate for the moisture it loses through its leaves to hot summer air. If you see your rhododendron leaves turning yellow, review each and every element of the plant’s care. One remains so! 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