Blue or bluish-purple blooms typically signify acidic soil (pH under 6.0), while pink or reddish flowers signify pH that’s alkaline (above 7.0). A pH between 6 and 7 will net purple or pinkish ...
New England and New York asters bear similar flowers in the same range of colors — purple, blue, pink and white — but New York asters tend to be shorter and denser, growing two-to-three-feet ...