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Camieux
most recent 26 MAY 20 HIDE POSTS
 
Initial post 26 MAY 20 by jedmar
This is called proliferation. Cells in the center of the rose are "malfunctioning" and producing new growth instead of the reproductive parts. The reason is not quite clear. There are many statements that a period of cold in spring can induce such growth, but this is not proven. Here is an explanation from the website of Apuldram Roses:

https://apuldramroses.wordpress.com/2012/05/21/rose-proliferation/

We have had it in our garden with 'Asta von Parpart' where 99 out of 100 blooms proliferated! There are reports of this phemonen since the 1760's, the rose called in England 'Childing Provence' (as it produces children) or 'Rosa provincialis prolifera'. Redouté painted a well-known picture of this rose:

http://rudolfshistorischer-rosen-park.blogspot.com/2013/07/spiele-de-natur-proliferation.html

I suspect that the gene structure of Centifolias has elements which encourages proliferation from time-to-time. Remember that also "moss" started on centifolias. With centifolias then being hybridized into further classes, this tendency apparently got distributed further. It is relatively seldom with repeating roses, and only with the first flush.

What to do? Some break off the proliferated buds so that the strength of the rose is not lost on "deformed blooms". With once-blooming roses, this may of course mean that you loose that year's bloom. The reports I have seen are that usually the following year's bloom has no proliferation. We did part part, left some as curiosity and broke off others.
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Reply #1 of 1 posted 26 MAY 20 by Camieux
Jedmar,
Thank you so much for your explanation. I understand now. Your response was much more helpful than anything I found online.
Sorry for the confusion with the photos. Sometimes this website is hard to navigate.
I think I am going to cut all the blooms off. There was a rose nearby that had Rose Rosette and I thought this might be a cause, but the blooms look much different than RRD. It is a pity as Desiree Parmentier is really beautiful when it blooms “correctly”.
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most recent 26 MAY 20 HIDE POSTS
 
Initial post 25 MAY 20 by Camieux
All of the buds on my Desiree Parmentier are deformed. Does anyone know what causes this?
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Reply #1 of 2 posted 26 MAY 20 by Rupert, Kim L.
It would help diagnose your issue if you would please post photos of how they are deformed.
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Reply #2 of 2 posted 26 MAY 20 by jedmar
I have answered to your picture under 'Désirée Parmentier'
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most recent 4 MAY 20 SHOW ALL
 
Initial post 28 MAR 10 by York Rose
What is the manner of growth of this climber? Are the canes at all lax, or are they primarily upright in their growth habit?
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Reply #1 of 2 posted 27 MAR 20 by Camieux
My Inspiration rose throws out huge strong canes, 5’ or more. I have been able to tie them to wire supports along a stone wall. This is a wonderful hardy rose! Rose was rooted from a cutting of my original plant and moved with me to a new garden. So far this plant has not been affected with RRD, as other adjacent bushes have.
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Reply #2 of 2 posted 4 MAY 20 by Camieux
The canes are very long and I have them “trained” horizontally along a wall. They are thick, strong canes. Vigorous.
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most recent 3 MAY 20 HIDE POSTS
 
Initial post 3 MAY 20 by Camieux
Can you tell me the name of this rose in the right hand corner of photo ? (Pink pom-pom).
Thank you! Lovely !
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Reply #1 of 2 posted 3 MAY 20 by Pascale Hiemann
It is a gallica-rose, I did find her at our cemetery. I could not identify her although I did search in books as well as in internet (HMF).
You can see her here:
https://www.helpmefind.com/rose/l.php?l=2.71022&tab=36
Regards
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Reply #2 of 2 posted 3 MAY 20 by Camieux
Thank you. It looks like one I have been searching for (22 years!) that was at my former old farmhouse, but that one had some repeat bloom later in the summer. It had all the other characteristics of a Gallica, plus very fragrant . Yours looks exactly like it. On mine some of the flower stems were weak giving a disheveled look to the shrub. Very distinctive. You have a beautiful garden.
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