Common. A large shrub / small tree with dense clusters of creamy-white flowers turning into blue berries. The unripe berries and most other parts of the plant are poisonous. Berries are sometimes “glaucous”, i.e. covered in a waxy or powdery white film that is easily wiped off. Formerly called Sambucus nigra subsp. caerulea. Photo #3 by CJH.