This plant popped up as a volunteer in a flower box in Winnipeg, Manitoba.
It is roughly 6-inches tall by 6-inches wide.
What is it?
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The plant is Convolvulus tricolor, the dwarf morning-glory. It belongs to the family Convolvulaceae.Blue, white, red and pink flowering cultivars of this plant are available$^1$. It is a annual/perennial growing to 0.3 m (1ft) by 0.2 m (0ft 8in) at a medium rate$^2$.