Pruning perennials

I am not sure is hydrangeas are considered a perennial or a shrub but
QUESTION anyway.  I know how to prune my mophead hydranges but I just bought
some Oakleaf and Peegee hydrangeas.  The oakleaf that I bought are very
large - over 5 feet tall and pretty wide.  The pruning book says to cut them
to the ground which sounds very extreme - would they grow back to 5'?  Does
anyone have any advice on pruning these?

TIA!
Margot Kane
Zone 7

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