A hardy soft-bark hydrangea variety that has huge, rounded, white blooms from mid to late summer. This very showy shrub grows to between 3-5 feet tall and between 4-6 fee wide. These shrubs enjoy a good watering and can adapt to part-shade areas. The Incrediball Hydrangea is considered an improvment on the Annabelle variety, having slightly bigger blooms and sturdier stems.