Hydrangea, Invincibelle, Garnetta #3Invincibelle Garnetta Smooth hydrangea Hydrangea arborescens Lusciously full mophead pink flowers are only one of the qualities that make Invincibelle Garnetta hydrangea so special. It also boasts supportive, sturdy stems (no blooms laying on the ground here!), a useful compact size, and reblooming ability for months instead of mere weeks of flowers. Blooming a bit later than the rest of the Invincible series, it's a fantastic season extender.