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'Cape Diamond™' rose Reviews & Comments
Discussion id : 121-768
most recent 25 MAY 20 HIDE POSTS
Initial post 25 MAY 20 by Rose_Insanity
In Z7a, east Tennessee, CD is absolutely disease free, growing in part shade. It has a spectacular Spring flush, with scattered bloom in the summer, and a small autumn flush. I've read comments that the Japanese beetles love it, but mine is generally not blooming much when they are here, so that's actually a bonus. The only pruning I do is to remove dead wood, and tip prune a bit. There is never any winter die back (I can believe the hardiness rating on this one). Generally it's one of the most carefree roses I have. The only drawback is the awkward growth pattern. It seems to grow willy-nilly, as-it-will. But since mine is in a semi-wild part of the garden, I just let it be its charming self.
Discussion id : 114-650
most recent 28 DEC 18 HIDE POSTS
Initial post 28 DEC 18 by Rob Byrnes
There are a number of nurseries and catalogs that list this rose as hardy to zone 3. Here is a reference that also indicates zone 3:

Roses Without Chemicals: 150 Disease-Free Varieties That Will Change the Way You Grow Roses – February 28, 2015
Page 105
by Peter E. Kukielski
Timber Press Inc.

In addition, the Weeks catalog indicates zone 3. Could the zone be updated to reflect zone 3?

Thank you.
Reply #1 of 2 posted 28 DEC 18 by Patricia Routley
Yes. Thanks Robert.
Reply #2 of 2 posted 28 DEC 18 by Rob Byrnes
Thank you Patricia.
Discussion id : 97-496
most recent 12 FEB 17 HIDE POSTS
Initial post 12 FEB 17 by JasonSims1984
It's pretty safe to assume this is a tetraploid, I think, given that it's a kordesii and one of its parents is a tet.
Discussion id : 29-937
most recent 7 NOV 14 SHOW ALL
Initial post 24 AUG 08 by Unregistered Guest
Weeks Roses claims that this rose survives to zone 3 without winter protection, in fact, "does
better in Northern climates". It is a Kordesii hybrid afterall. Could your "6 B" rating be a type-o?
Reply #1 of 4 posted 28 SEP 14 by Rob Byrnes
Both parents are hardy to zone 3 so I'd be surprised if Cape Diamond wasn't hardy to zone 3 as well.
Reply #2 of 4 posted 5 NOV 14 by Gagnon98
Certainly its performance here in CT in Z6 would suggest it is much hardier than just Z6. It is super duper vigorous. The winter of 2013-14 was horrendous up here. Many of my roses got frozen to the ground. Probably 85% cane die-back on my climbing Polka, which is supposed to be pretty hardy. Only Zepherine Drouhin and Cape Diamond were completely unfazed. Because it gets so big and rangy (arching canes to 6'+ esp in fall), I cut it back to about 1-2' in early Spring. It is absolutely true that it does best in cooler weather. Spring flush is great. This summer, because it's was overall pretty cool, it bloomed clear through to now. And it still has bloom clusters on it. Growth pattern is terrible and wicked thorny. Japanese beetles devour it. I really want to chuck all three of them but it flowers well and I love the scent. For now, they stay!
Reply #3 of 4 posted 7 NOV 14 by Rob Byrnes
Thanks for sharing your experience with CD. Now I know more about what to expect as far as growth habit. Leaves were nearly spotless this season.
Reply #4 of 4 posted 7 NOV 14 by Gagnon98
You're welcome. Good luck with it. I've never seen blackspot on my three CD, and it is prevalent in my garden every year. I do not spray them either. In fact, since planting them I don't think I've ever fertilized or fed them, really. So, in your much more expert hands, they'll flourish. Enjoy!
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