Annabelle Hydrangea: Annabelle hydrangea is one of the easiest types of white flowers to grow. It blooms in midsummer producing large, pure white clusters that are perfect for cutting. Plant Name: Hydrangea arborescens 'Annabelle'. Growing Conditions: Part shade and moist, well-drained soil. Size: To 5 feet tall and wide. Zones: 3-9. Plant it with: 'Annabelle' is a perfect partner for bigleaf hydrangeas or oakleaf hydrangeas.