Why do rose bush leaves turn yellow?

Answer

Rose bush leaves turn yellow for several reasons; mainly those to do with too much heat. Too much shade or excessive fertilizing are other reasons rose bush leaves turn yellow.

Heat stress is common in rose bushes. This results from direct heat during sun exposure or radiant heat from the ground. Radiant heat causes the lower leaves of the rose bush to turn yellow and eventually fall off. The upper leaves become exposed to the radiant heat and the process repeats. Adding pine straw, mulch or any other type of ground protection under the rose bush solves this problem.

If the leaves do not get enough sunlight, they turn yellow and fall off the bush. This happens to leaves at the bottom of the bush when the top leaves grow large and prevent the sun from reaching the lower leaves.

Over-fertilization causes yellow leaves on roses. The fertilizer actually burns the foliage and the leaves change color and fall off the bush. This occurs with both liquid and granular fertilizer. The way to avoid this happening is to only use the recommended amount of fertilizer and to be careful not to spray directly on the leaves.

Too much water also causes rose leaves to turn yellow. If water pools underneath the rose bush rather than the ground absorbing it, it causes yellowing. The sun reflects off the water and causes overheating on the leaves, which then turn yellow. If the ground under the rose bush feels damp, it does not need water.

Q&A Related to "Why do rose bush leaves turn yellow?"
The virus rose mosaic appears as yellow discolorations on the leaf surface. The discolorations may resemble spots or they may form yellowed wavy lines on the leaves. Mosaic isn't
http://www.ehow.com/info_8014029_leaves-roses-turn...
The most common recommedation for roses is at least 5 to 6 hours of sun, so your rose should be getting enough sun. Some of the older leaves on your bush can naturally turn yellow
http://answers.yahoo.com/question/index?qid=200807...
You've either let the rose bush get too dry or over watered it. Also check on the back of the leaves (also in the rose pedals) for bugs. If you have any insects on the bush then use
http://wiki.answers.com/Q/Why_would_the_leaves_on_...
This is called. Chlorosis. and it means the green chlorophyll is not present. All you are seeing is the other leaf pigments that are normally not noticable because they are masked
http://www.quora.com/Gardening/Why-do-the-leaves-o...
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