"Climbing" roses don’t have holdfasts or tendrils or twining woody vines to hold on to the plant they clamber up into, so they’re not like the potentially choking experience of wisteria or akebia or even some ivies and such. They sort of lean on the host plant more than literally attach themselves.
That said, this sounds like one very ambitious rose, and it will definitely cause shade that the plum won’t like, and that may cause some weakness on the shaded side of the tree, etc.
I tend to enjoy things like this for a year or so, then cut them back hard to start over (rather than let it go way too far and positively smother the tree with its own branches and foliage).
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.