Thorns on Renae?

hardyyehMay 17, 2013

I have a young 7-feet-tall tree rose of Renae. I grafted the rose last year and the buds began shooting around this time of the year last year. The first thin growths were thornless, but this year's flush of new growths have been quite thorny. The thorns are produced regularly with about one or two thorns for every node. And all new branches and basal shoots are equally thorny....

Is such sudden production of thorns normal for Renae? Or is it possible that my plant has sported into a thorny form? Or could it perhaps have something to do with the rootstock? (It's grafted onto a thorny Chinese rootstock)

The budwood I got was completely thornless, and so was the first year's growth. I do hope this is just a passing phase and the plant will grow out of it!

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Thorns are natural for roses, period. It is very common for traditionally thornless roses to produce some. I grew Annie Laurie McDowell for more than twenty years prior to finding my first thorn on it. Even Banksiae produces prickles occasionally. Thornless climbing roses are really completely against Nature as the "thorns" are what they use to "climb". Here is the link to my earlier thread about Banksiae prickles.

It is not common for Renae to produce thorns, but it completely genetically possible. Renae sported to a single form for Burling Leong (linked below) and this sport has prickles. If these prickly canes produce single flowers like this sport, you probably have a similar mutation on it. If they produce traditional Renae blooms, it may have mutated to a prickly form, or it may just be doing what it CAN do. If you don't like the prickly canes, prune them off. Kim

Here is a link that might be useful: Burling's Single Renae Sport

    Bookmark   May 17, 2013 at 12:56PM
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Aww... I see. Thanks Kim for such a detailed answer, also the links you provided. Last year's blooms on the thornless canes were double just as Renae would look like. It bloomed in a few flushes from late summer right to autumn. Then from winter onwards began the prickly growths, and no more flowers so far. I guess I'll have to wait to see if the blooms are normal this year.

As for pruning prickly canes, I guess that's currently not an option, because all its new growths have thorns. And the canes came from two grafted buds at that, now all became thorny without exception.

It's placed next to a path with heavy foot traffic, actually a gift to the building where I study in college. But whether it can continue to stay there will depend on it stopping to produce those thorns. So I really hope it'll revert back to thornless mode like it was last year. Shall cross my fingers and wait then. Thanks again! ~Hardy

This post was edited by HardyYeh on Fri, May 17, 13 at 14:16

    Bookmark   May 17, 2013 at 2:13PM
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Recently my Renae plant grew a thick basal cane that burst into bloom.

The long cane is completely smooth, and the blooms are double.

I am so glad that all its current growths are completely thornless, and I hope it'll stay that way. Here's a picture of the plant, growing in a large pot next to a gravel path.

    Bookmark   July 10, 2013 at 11:56AM
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Lovely! Congratulations! Kim

    Bookmark   July 10, 2013 at 12:13PM
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meredith_e Z7b, Piedmont of NC, 1000' elevation

Oh, good! The smoothness of her canes is one of my favorite features of her, so I'm glad yours has stopped misbehaving ;)

    Bookmark   July 10, 2013 at 6:18PM
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My Renae is always simi double in the spring and very double in the heat of summer, and once in awhile in the twenty some years that I have been growing it a thorn pops up to catch my attention.
I haven't been on this forum in years do to bad health. My garden has suffered greatly because of my health problems but now I am trying to rebuild it. I lost most of my roses during my illness but Renae is one that is still growing and blooming with no change. I just purchased Annie Laurie McDowell can't wait to see how she stacks up in my garden. Great week ahead of me, just picked up a large order of roses from Burlington Roses to start replacing those lost.

    Bookmark   August 16, 2013 at 10:18PM
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Very cool plantings. Good health to you, rosepat.

    Bookmark   August 17, 2013 at 11:10PM
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