Annabelle Hydrangea are the hydrangea that never fail to bloom. They bloom on current growth so the flower buds are never affected by frost or freezing temperatures.
My plants and my cuttings did just fine last winter even though it got down to -21 below zero, so they are tough as nails. The unrooted hardwood cuttings also experienced those same temps and still rooted and grew like crazy.
They won’t give you too much trouble if grown in average, medium moisture, well-drained soils in part shade. The Annabelle Hydrangea can handle full sun only if kept consistently moist. They aren’t very tolerant to drought conditions so the foliage might not grow as well as you’d like.
Bloom occurs on new wood, so prune the plants close to the ground in late winter to encourage stem growth. Weakened and/or damaged stems should be removed in early spring.
Prune anytime between October (or when the blooming is done) and April. Do not prune during the growing season. The plants starts growing like crazy in April, then come July they start making flower buds on the ends of the new branches and start blooming in late July.
Here is a video I made at the nursery for you!