If your soil is particularly dry, you could try adding some moisture-retaining organic matter to make it an ideal growing space.
It’s best to add manure or compost before planting your hydrangeas, however.
Keep your plant well-watered throughout its first few seasons to help it get used to its new environment.
When you do water your hydrangeas, you should try to water in a well, as opposed to dumping it on top of the leaves and waiting for it to filter down.