Hydrangea arborescens Strong Annabelle is also known as Incrediball. A recently introduced variety, which has eye-catching really large ball-shaped flowers (up to 30cm in diameter) which cover the plant over an extended period from mid to later summer. It was bred to develop strong stems to support such large flowers & therefore be an improvement on a number of its predecessors where sometimes the stems can bend or brake due to the flower size. Therefore larger flowers & stronger stems! Flowers June-September. Height 150-200cm. Supplied in a 3 litre pot.