These flowers are called Ornamental Allium's, their colors remind me of lilacs but they don't grow on a tree. These get panted from bulbs and are known to grow quite fast. I will usually find them in rock gardens or other deliberately planted flower beds.
They are deer-resistant and mildly toxic to humans and pets, so if you have any animals around, make sure they don't start chomping away on them. Mostly native to the Middle east they grow well in Canada due to their ability to resist cold and heat so they can handle temperature changes without to much difficulty.