Bigleaf Hydrangea (Hydrangea macrophylla 'Brestenburg') aka French Hydrangea, Hardy Hydrangea, Mophead. I bought some of these in 8" pots from Kurt Weiss at Aldi. Medium, blue flowers; part to full shade; compact grower to 4 to 5' tall. Prune each spring, removing last season's flowerheads to the first buds beneath. Up to one third of a mature plant's oldest flowered shoots may be trimmed to the base, to promote new growth.