Author of quotes: How to improve the site? Spiraea

Hello. This year, as planned, we are finally finished with the construction and renovation of our new home for the whole family. Now we had a question of how and what to decorate and ennoble the remaining area near the house. My wife wants to plant flower beds there, in particular unusual plants and ornamental flowers. I found the seeds of a certain stepleg, and wants to plant it in the first place. Friends, if you know, then tell us how this meadowswall grows in general, what kind of care is required for it and any other information. I would appreciate your answers)