Hello Danielle,

It looks like you have a Panicle Hydrangea (Hydrangea paniculate). Read about Panicle hydrangeas here: https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=286891&isprofile=1&basic=Hydrangea%20paniculata

Panicle hydrangeas are tolerant of most soils but prefer moist well-drained soil and sun to part shade. Your plant may need more sun to thrive. It is difficult to tell from the picture but it may still be recovering from the transplant. Read here about how to transplant trees and shrubs. https://mortonarb.org/plant-and-protect/tree-plant-care/plant-care-resources/caring-for-new-transplants/#support

There may be a problem with the roots. You can carefully dig up the plant and inspect the roots. Are there fat white roots or are they black and wet? A hydrangea needs about 1 inch of water a week. If the plant is too wet—the roots are black and soggy—make sure that the water is draining properly in the hole. Remove the plant and do a percolation test. https://www.canr.msu.edu/news/determining_soil_infiltration_rate

If it fails the test, move it to a better spot. To establish whether the soil is the culprit have the soil analyzed. For a testing kit, go to: https://shop.msu.edu/products/soil-test-mailer

To read more about hydrangea care read here: https://extension.oregonstate.edu/gardening/flowers-shrubs-trees/general-care-hydrangeas

Thank you for contacting Ask Extension.