Certain cultivars, like the 'Pugster Blue', produce deep indigo-blue flowers, while others lean more true purple, red, white, pink, or yellow. Butterfly bushes grow well in hardiness zones 5 to 10 ...

Q: Why are more fruits and flowers red, orange or yellow than blue? —Robert L. Morrison | Poughkeepsie, New York There is actually no true blue pigment in nature. A pigment creates color by ...