Genus - Spiraea
Spiraea is a genus of over 80 species. All species are deciduous. The name is derived from the Greek speiraia meaning meadow sweet. Most spiraea bloom in either spring or summer in white, pink, purple or yellow.
The Spiraea ulmus plant contains the active compound in aspirin, acetylsalicylic acid. In January of 1899 Bayer decided to name their wonder drug aspirin. The "spir" component of the name comes from Spiraea.
Culture - Grow spiraea in sun to mostly sun although some will tolerate half shade. The bloom tends to be better in more sun. Make sure they are in well drained soil. A good rule of thumb for trimming would be to trim right after the blooms fade.