That is called liatris " gay feather " , it is a Canadian/ Ontario Canada native plants , and yes it bloom from bottom to top . Your farden phlox grow too dense, so in the early spring should trim off some in the middle to improve air circulation and prevent mildew, the white garden phlox is called " David " the pink one probably is " prismatic pink " . And it is call Annabelle hydrangea and the other one is big leaf hydrangea or mop head hydrangea ( hydrangea microphylia ) , your soil is moist so you are lucky, but besides echnicia and liatris , but you have a sweatbush shrubs, that also native American plant, so i give you a tump up, i am also in Toronto and a gardener , good to see Chinese people grow perennial not just vegetables, but it us better to use botanical name not a knickname to call the plants.