Put trailing varieties close to the front and side edges of the window box, well-rounded types in the middle, and taller, rigid or spiky selections in the back for height. In this sun-loving display, waves of delicate snow-white sutera, trailing white petunias, calibrachoa 'Million Bells Trailing Blue', flossy-topped periwinkle-blue ageratum, lavender-flowered verbena, and variegated vinca vine are effervescent partners for classic white and pink geraniums—traditional window-box favorites.
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