Arboricola (Schefflera arb..) is done all the time, though a cutting will take years to become do-able in terms of real styling, etc. Hydrangea is also done, but is it one with smaller flowers rather than the big-ball type?

My hydrangea is a climbing one not the ball flower type. Has small white flowers. It is 36 inches from soil line to the tip of the one vine. I could cut it back that would be no problem. I worry more about cutting the roots back. Does anyone have any tips or good articles that I can read.

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Rootball of climbing hydrangea