14 years ago. Healthy, vibrant leaves are an important part of the spring performance of a rhododendron (Rhodenderon spp.). Azalea/Rhododendron > Leaves > Curled, cupped, or distorted leaves. Both have slow release 'pellets' put in by reputable local nursery! Yellow rhododendron leaves often represent the plant’s expression of dissatisfaction with its care. 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 … 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. Title: Why do Rhododendron Leaves Curl? Curled up leaves This happens when it gets cold during winter as the plant tries to conserve water in the cold spell. I recently purchased two Rhododendron's in a 15" x12" plastic tub. If you see your rhododendron leaves turning yellow, review each and every element of the plant’s care. Rhododendron leaves curled and dry looking. bonitaapplebum. Summer Heat. 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. When the temperature drops below 35°F, rhododendron leaves begin to cup and curl at the edges. The shrub's colorful blossoms are meant to be viewed against a lustrous backdrop of green. This happens just before winter or in summer drought. Rhodies are picky about the soil you plant them in and about how much water they like. Leaf scorch occurs when a plant receives too little water to compensate for the moisture it loses through its leaves to hot summer air. Author: Erik Tallak Nilsen Created Date: 9/8/2006 11:04:03 AM The second has started to curl it's leaves. At 25°F, the leaves have curled so tight that half the leaf surface has disappeared and the leaves droop. Rhododendrons are bushy and approximately 15" tall. A rhododendron rated hardy to 5°F, no matter how beautiful it is, planted in Green Bay, Wisconsin, will not survive. At 25 ºF, the leaves will be curled very tight and begin to droop. The rhododendron did receive waterings when the leaves started to look a bit limp. This summer was very hot and dry in our area. Leaf Curl: Rhododendron leaves begin to cup and curl at the edges when temperatures drop to below 35 ºF. When brown leaves show up in a rhododendron, it's usually at winter's end -- right before flowering time. It looked pretty tired, and dropped a number of leaves. Most varieties exposed to unprotected all-day sun are doomed. As more and more home gardeners in the Southern and Midwestern states begin to grow rhododendrons, increased attention must be paid to the hot summer sun. 1 of 3. One remains so! 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