I’ve had zero luck with hydrangea cuttings
They won't root in water.
I stuck two in spaghnum moss & 1 in pot soil inside, after a month or so they rooted.
I took the fresh of a plant the neighbours were dumping.
Garden articles mention rooting powder, I didn't need it but maybe that will help?
@JWestland started
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I’ve had zero luck with hydrangea cuttings