Your double-decker tree rose lost its top graft. You can remove the dead portion, but precision is critical to save the bottom rose.
The bottom rose (likely the first graft) is hardy and established. Removing the dead weight prevents disease entry and redirects energy. The rugosa trunk may try to sprout—those shoots have different leaves (rugosa foliage is distinct). Rub them off young.
Your tree rose becomes a single, beautiful standard. Simpler, hardier, longer-lived.
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