Nothing brightens the front of a home like window boxes filled with colorful blooms surrounded by foliage plants with varying shades of green, blue and silver. There are a considerable number of plants well suited for window box planting no matter where they are located on the hardiness zone map. Grow plants with similar water or soil needs in the same box to ensure healthy, happy window box plantings.
Asarina 'Victoria Falls' (Asarina purpusii)
Victoria Falls is not the typical climbing Asarina. This variety has arching stems that grow to approximately 8 to 18 inches tall. Pink-purple trumpet-shaped flowers begin to open in late spring and continue to put on a show cascading en masse until the first frost kills them back.
Dragon Wing Begonia (Begonia x hybrida)
Dragon Wing begonia adds a variety of color to the window box from shades of red and green to bronze. These plants grow to 12 inches tall with a spread of approximately 15 inches and have a mounding habit that adds height to the container. Begonias prefer a well-drained, healthy garden soil and are heavy feeders. Plants should be set where they receive partial shade or dappled sunlight at most. Dragon wing begonias have red blooms throughout the growing season.
Hardy Iceplant 'Stardust' (Delosperma floribunda)
Iceplant is perfect for window boxes on the sunny side of the home. Hardy Iceplant takes heat and lack of water longer than many other plants, all the while vigorously growing and spreading across its container. Blooms of 'Stardust' are pale purple and white, 2 inches wide and begin in late spring lasting until the first frost. Hardy Iceplant is an excellent choice for filling in around other container plants.
Licorice Plant 'Silver Mist' (Helichrysum microphyllum)
Silver Mist licorice plant has silver foliage that adds an extra layer of color to the container garden. This plant has a low mounding habit with a wide spread. The Silver Mist grows 6 to 8 inches tall with a spread of up to 24 inches. Licorice plant is tolerant of hot sunny locations.
Dwarf Snapdragon 'Summer Skies' (Chaenorrhinum origanifolium)
Chaenorrhinum origanifolium is a short-lived perennial known as dwarf snapdragon. Tiny bright blue, bell-shaped flowers open in mid-spring and last until late summer/early fall. C. origanifolium will grow to 10 inches tall and 12 inches wide with a slight trailing or spreading habit and would make a nice fill-in plant choice for window boxes. Summer Skies is a perennial that grows best in full to partial sun in well-drained soil.
Swan River Daisy (Brachycome iberidifolia)
Swan River Daisy offers remarkable color to the window box arrangement. Colors range from very dark blue to violet to white and shades in between. The plant itself forms a nearly round shape to 10 inches tall. These daisies will add height and color to the window box.