Hydrangea 'Pink Annabelle' This Hydrangea is the first aborescens variety to produce intense pink flowers and is extremely hardy. The stems remain upright in all weather and are strong enough to bear the large blooms, which have a diameter of up to 30 cm. Plant the ‘Invincibelle’ hydrangea in full sun for best results, but partial shade is fine too. Make sure they have sufficient watering. Height supplied 10-15 cm.