Please help me identify this bush
We moved in to our house last April, and during the craziness of the move I did not notice this flowering bush (either that or it didn't blossom last year). Anyways, here is a picture of one of the blossoms.
Can somebody please tell me what it is so that I can know how to care for it? It only had a few blossoms this spring, and there was some type of invasive green shoot that was growing near its base.