If you’re in a high plant hardiness zone in the southern United States, monitor your hydrangeas carefully during the height of summer. If the soil 4 inches below the surface feels dry ...
Depending on the species, hydrangeas grow in USDA Hardiness zones 3 to 9 (find your zone ... for the Southeast are the paniculata and quercifolia types because they’re generally more forgiving ...
Two hydrangea species are considered native for U.S. East Coast and suitable for U.S.D.A Hardiness Zones 5-7. They are: H. quercifolia (oakleaf hydrangea) and, H. arborescens (smooth or wild hydrangea ...