I'm a 25 year specifier of plants (landscape architect, retired) and the last place I'd advise going to for serious information is Home Depot. I have bought plants there and I don't blame the staff, and some of them know some stuff. But for a botany related job, meh.
Are there any smaller store type garden purveyors in your area? Some of the people who start that kind of place know what they are talking about, in my experience.
Not all of course, but check them out.