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. Window-Box Basics By: Marjorie Gage, This Old House online
Shade garden - Black Mondo Grass. I absolutely LOVE this stuff. Imagine it growing as a border for flowering plants with bright colors. Also makes a great mass planting surrounded by a stone border. Or in planters or flower boxes for contrast.
Shaded window box idea- Use White to Add Elegance A single color -- here, white -- accented with variegated foliage is graceful and beautiful in a simple window box. A. Geranium (Pelargonium 'Orbit White') -- 1 B. Ivy (Hedera helix 'Glacier') -- 4 C. Bacopa (Sutera 'Snowstorm') -- 3 D. Impatiens 'Xtreme White' -- 2