Is it possible to grow hydrangeas in a container? If so, how deep does the container have to be?

Sure .. You can grwo them in containers . The size of the container all depends on which type you are growing , but I have done well

with most types in a 5 gallon container. They like water ( hence their name ) so make sure they are well watered in the summer months.

Come the winter , they can survive quite well outdoors ( but not too cold - they bloom on " old wood " ; what was grown the year before )

an unheated garage or enclosed porch would work well ....
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