Thank you for contacting the Toronto Master Gardeners with your inquiry. The shrub in question is a beautiful example of Hydrangea paniculata.
Hydrangea paniculata is a species in the family Hydrangaceae native to southern and eastern China, Korea, Japan and Russia (Sakhalin). Best grown in organically rich, medium moisture, well-drained soils in full sun to part shade. In cultivation it is pruned in spring to obtain larger flower heads. This is one of the most winter hardy of the hydrangeas. It thrives in urban conditions. Bloom occurs on current season’s growth, so prune as needed in late winter to early spring.Larger flower panicles can be obtained by thinning the plants to 5-10 primary shoots