I don't know where you are, but I have a Hydrangea petiolaris that i planted 40 years ago on a NW facing wall. Close-to-the-house in poor soil and builders' rubbish. Apart from keeping it under control I have done absolutely nothing. No water, no fertiliser, no pesticides, nothing.
location: Surrey Hills, England, ex-woodland acidic sand. "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
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"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."