Named after a castle in Switzerland. With cherry red flowers, sepals unusually wide (5-6cm), oval and entire, on long pedicels. Flowers sometimes hidden by abundant foliage.
A new and distinct cultivar of Hydrangea named ‘Abetwo’, characterized by its upright and mounded plant habit; strong and sturdy stems; dark green-coloured leaves; and large mophead-type inflorescences with numerous white-coloured sterile flowers.