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'Blanc Double de Coubert' rose Reviews & Comments
Discussion id : 166-649
most recent 6 APR HIDE POSTS
Initial post 6 APR by Bug_girl
Pearson's Encyclopedia of Roses (1956), pg. 172.

Blanc Double De Coubert
(R. rugosa alba sport)
A large, double white blooms, very pleasing in the bud stage. Typical rugosa foliage. Fragrant. Makes a good hedge about 6 ft. high.
(Cochet-Cochet, 1892.)
Discussion id : 130-039
most recent 11 DEC 21 HIDE POSTS
Initial post 11 DEC 21 by Duchesse
diploid, per Zlesak 2009, Pollen diameter and guard cell length as predictors of ploidy in diverse rose cultivars, species, and breeding lines. Floriculture and Ornamental biotechnology.
Reply #1 of 3 posted 11 DEC 21 by HubertG
I'm surprised at this. When I grew this rose it never set hips at all.
Reply #2 of 3 posted 11 DEC 21 by jedmar
In this article by Zlesak he lists roses by "reported" (Table 2) and "confirmed" (Table 3) ploidy. 'Blanc Double de Coubert' is on the former list. The reference for the reported ploidy is given as Modern Roses XI. I am sceptical about using the ploidy levels from MR since I have seen that in Modern Roses V a ploidy level has been assigned to practically every rose. I had a feeling that these were assigned there arbitrarily according to class. No source is given. Preferably we need original research as a basis. Table 3 listing is therefore ok.
Reply #3 of 3 posted 11 DEC 21 by HubertG
Thank you. That makes sense.
Discussion id : 112-336
most recent 17 JAN 19 SHOW ALL
Initial post 22 JUL 18 by JasonSims1984
This rose is triploid. That makes the parentage possible, because Sombreuil is a tetraploid. Also, the thin petals and fragrance make it very possible that a tetraploid white HP or HT can truly be one of the parents. I have read this in several rose books.
Reply #1 of 2 posted 17 JAN 19 by AquaEyes
The "Sombreuil" alleged to be a parent of this rose would have been what we now refer to as 'Mlle de Sombreuil', the Tea. The "Sombreuil" you're thinking of is the one aka "Colonial White", which is likely a 'New Dawn' descendant climber. The Tea would be most likely diploid, or maybe triploid. The climber tetraploid. Do you have a reference for 'Blanc Double de Coubert' being triploid, or are you assuming it based on the climber "Sombreuil" being a parent?


Reply #2 of 2 posted 17 JAN 19 by JasonSims1984
I do have references, but not at the moment. :/

You're right though, about the tea rose, as opppsed to a New Dawn descendant.
Discussion id : 110-481
most recent 2 MAY 18 HIDE POSTS
Initial post 2 MAY 18 by Margaret Furness
The Wills cigarette card says Blanc Double sets no hips. It has 2 first-generation descendants listed; one via pollen, one that might be a sport. A couple of photos show hips (in Europe).
Sounds like there are two roses using this name.
Reply #1 of 5 posted 2 MAY 18 by Andrew from Dolton
yes Margaret, and according to Suzanne Verrier 'Souvenir de Philemon Couchet' sets no hips. The plant I have as 'Blanc double de Coubert' is 12 years old and has never thrown up a single sucker
Reply #2 of 5 posted 2 MAY 18 by HubertG
The buds in the Constance Spry flower arrangement photo look quite different to the buds I remember, and to most of the photos here.
Reply #3 of 5 posted 2 MAY 18 by Andrew from Dolton
Yes very much so HerbertG, they also show more stamens and are less double than the plant I grow. I always thought 'Blanc Double de Coubert' was a cross with rugosa 'Alba' and 'Sombreuil'
Reply #4 of 5 posted 2 MAY 18 by HubertG
Andrew, I remember that was the pedigree that was quoted when I bought it (20 years ago), and I assumed it was infertile because of the incompatible species mix. Do you have any photos of your rose to post?
Reply #5 of 5 posted 2 MAY 18 by Andrew from Dolton
Hi HubertG,
Here is a link to a photograph and discussion I had regarding this rose with Patricia and Jay-Jay. My rose is very typically rugosa in its re-flowering, loads of tomato like hips beginning to ripen in August then a decent repeat bloom.
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