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The cheery blue color of dayflowers (Commelina communis) — so named because each flower lasts but a day — does nothing to dispel some pity I feel for them. Not that the petals cry out for sympathy. You have to get fairly close to the plant, or really stop and look at it, to even see its blossoms. Its stems and leaves, though, are bold, seemingly ready to gobble up any piece of ground they can grab with their succulence and lushness.