Hydrangea macrophylla 'Sister Theresa' is a stunning deciduous shrub prized for its beautiful white blooms. It boasts a mounded habit, making it an excellent choice for garden beds and borders. This hydrangea thrives in USDA hardiness zones 5 through 9 and prefers temperatures ranging from 60 to 75°F for optimal flowering. The 'Sister Theresa' variety is notable for its rounded clusters of delicate, star-shaped white flowers, which can turn pink in more acidic soil conditions. The mature height of this plant can reach up to 3 to 6 feet, with a similar spread. Although not deer resistant, it is a favorite among gardeners for its vibrant display and adaptability to a range of light conditions, from full sun to partial shade.