Upright white-flowering branches on a weeping cherry are rootstock (Mazzard cherry) suckers. The weeping top (Prunus subhirtella 'Pendula') is grafted. Remove all upright shoots cleanly at their base—only the weeping portion should remain.
Weeping Cherry Gummosis: Identifying and Managing Sap-Like Ooze
Replanting Weeping Cherry After Borers: Soil Treatment and Care
Weeping Cherry Oozing Black Tar: Slime Flux or Borers?
Pruning a Young Cherry Blossom Tree: Timing and Technique
Reviving a Struggling Weeping Cherry: Fertilize and Monitor
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