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Half graft

Posted by wvbrent 6 WV (My Page) on
Thu, May 29, 14 at 8:17

After our bitterly cold winter, a large Ilse Krohn Superior bush, normally with an ivory white bloom, now has profuse single pink blooms on over half the plant. I assume this is root stock? Funny thing is, the pink blooms are on very thick old canes, and I've never had these pink blooms before. I assumed that the root stock flowers would show up on new canes. There are still some of the white grafted blooms, but not many. If I I attack and remove these pink-blooming canes vigorously, do I have a chance of reclaiming the Ilse Krohn blossoms, or should I be considering replacement?

Follow-Up Postings:

RE: Half graft

No - it is not possible for "rootstock" blooms to suddenly show up on old canes which previously produced blooms of the scion (desired top rose). Rootstock blooms will always show up on their own canes, whether old or new.

However it is possible that the "old" canes with the single pink blooms were there before, but not yet blooming, so you did not notice them. In that case they could be rootstock.

Please post a picture of the single pink blooms - someone may be able to identify them.

The other thing which might have happened is that your rose sported (mutated) to this new bloom type, but again the canes which are now "old" would have existed in prior seasons, possibly not yet blooming. I believe that sports can happen on new growth off old canes, but to take over half of the bush it seems to me that you would have noticed them before.

Please post a pic of the entire bush - this will be interesting to everyone!


RE: Half graft

There is another possibility called a graft-chimera, but is very unlikely.

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