Patent PP27879 was granted and assigned to Spring Meadow Nursery, Inc. on April, 2017 by the United States Patent and Trademark Office.
A new and distinct cultivar of Hydrangea plant named ‘JoAnn’, characterized by its loosely upright and outwardly spreading plant habit; strong and sturdy stems; relatively small leaves; freely flowering habit; large showy inflorescences with sterile flowers that are initially white in color and with development become pink to rosy violet pink in color; and good garden performance and winter hardiness.