If they're in the right location and are maintained regularly, container plants will bloom from early spring until the first killing frost in autumn — longer if you load them with perennials and over-winter them indoors.
DEAN FOSDICK Associated Press deanfosdick@netscape.net, St. Louis Post-Dispatch: Living
Tue, 02/21/2017 - 7:00am
If they're in the right location and are maintained regularly, container plants will bloom from early spring until the first killing frost in autumn — longer if you load them with perennials and over-winter them indoors.