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Questions, Answers and Comments by Category
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My Sympathie has some branches with rather pale green leaves and one where the tip has almost white leaves. We had rather late rather severe frosts this spring and I suspect these might be the weaker branches that got damaged by frost but not quite enough to actually die. In fact on one of them most new sprouts died and it now has laterals and leaves only on the top quarter of its length or so. The rest of the rose and all newer (post-frost) sprouts are fine.
My question is, is frost (rather than undernourishment or sickness) the likely explanation for this, and what should I do? These canes bear buds. Do I have to remove the parts with pale leaves, and if so, can I wait until after flowering?
Thank you for any advice.
[Hm ... five days and no reply. Surely with all the expertise assembled at HMF someone should be able to comment? Or did I ask in the wrong place?]
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HMF is designed as a tool where you can do your own research for the answers to your questions without waiting for someone in the rose community to respond. Have you done a search for "yellow leaves" in the Q & A archives ? There are many posts mentioning the causes of leaves turning yellow. Some will apply to your question.
Often someone may ask a question on the Q & A Forum where the answer is more complicated than they think, i.e., yellow leaves can have many, many causes, or no one currently using the forum has the answer to your question. Doing your own search is the best first step.
Smiles,
Lyn
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Thank you for the reply. I did search. Nothing that turned up seemed to match this particular problem. People were talking about the bottommost leaves of a plant turning yellow, or all of them at once, but not just the tips of some branches like with my rose. Since I had a particular guess as to the reasons I felt someone with more experience might be able to comment on the validity of that guess, and what to do about it.
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I am glad you did the search. I did find an article about freeze/frost damage that may help you. Here's the link:
http://www.nashvillerosesociety.com/springfreeze.html
Smiles,
Lyn
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That was very interesting, thank you. Although the symptoms described in the article don't quite match those I'm seeing. Seems my guess was wrong and the problem is something else entirely. Back to square one ...
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Look for "chlorosis" or iron deficiencies. I was reluctant to answer your earlier post, but that's what your photo looked like, at least to me. I caused this problem for myself one season by not having proper soil pH; mine was far too alkaline.
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Thank you! I did research chlorosis a little, but it seems typically the young leaves on the entire plant would be affected? And the leaves on mine look this way only on the ends of two branches out of several, and there are younger shoots elsewhere on which the leaves are dark green and quite "normal". Could an iron deficiency occur only locally?
Just found a post on a German rose forum where someone said yellow leaves might be caused by frost after all. We had late frosts all over Germany this year and apparantely I am not the only one with this problem ...
Oh well, guess I'd better not worry too much, as long as the damage is local. I suppose I'll let those branches bloom, then remove them entirely. There is enough new growth on that rose to make up for it, easily.
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I can't address the potential for damage by frost or freezing as we never experience anything even close to that here near Los Angeles. Now, if you want to know how to keep the rose from spontaneously combusting from heat, I'm your guy! I agree with Slugger, it looks as if there might be some alkalinity or drainage issues.
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"Now, if you want to know how to keep the rose from spontaneously combusting from heat" ...
Unfortunately an unlikely problem for Hamburg on 54 N! I'll come back for your advice when we buy our house in Provence ...
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I'm in a zone that experiences colder temperatures, and occasional frost damage. Here in the states the mid section of the country experienced freakishly high temperatures in March and April, and then a nosedive with a few frosts in May. As a result, many of us had rapid, early growth on our roses that succumbed to some frost damage in May. Frost damage will look like partially burnt leaves; the edges will 'rumple' and turn brown and crispy.
There is a paper from the Colorado Master Gardeners that explains the following:
"Iron chlorosis shows first and more severely on the newer growth at branch tips....It is common for iron chlorosis to show on a single branch or on one side of a tree. The primary symptoms of iron deficiency include interveinal chlorosis, a general yellowing of the leaves with the veins remaining green."
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Thank you so much for your comment. I suppose when the leaves are damaged by frost that's different from a leafless branch getting damaged, then producing new leaves (which was our case, as our roses are leafless until well into spring)--these new leaves on frost-damaged wood wouldn't look burnt? Just weak? But your quote on chlorosis seems convincing too.
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