Rose trees are grafted trees. The new trunk coming up is from the roots of the grafted standard that the top desired rose was grafted onto. So that would not produce another rose tree. It is best to prune out the new trunk as it only steals nourishment from your current rose tree. Sorry to say this but eliminating the new growth is the best thing you can do for the rose tree you love. Her is a link to an article I wrote about rose trees for you: https://www.gardeningknowhow.com/ornamental/flowers/roses/learn-more-about-tree-roses.htm
Answered on May 13, 2018
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