Answer: Don't be concerned about the ivy on your oak trees. English ivy is not a parasite. It clings to any support by aerial rootlets which do not penetrate the bark. It's actually considered beautiful to have Ivy decorate oak trees. It only becomes a problem if insects and rot organisms get in the foliage and start tunneling in the bark. This is only a problem if the tree is weak anyway, so I wouldn't worry about it.Enjoy!
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