Window boxes create ideal growing conditions for plants. This is the opportunity to use a soil mixture that is lightweight and tailored to the needs of your plants. Make sure that the window boxes have adequate drainage holes to prevent water logged soil. Choose young, healthy plants that are more adaptable to new growing conditions than older plants. Plant your seedlings closer together in a window box than in the flowerbed. Place the trailing plants near the edge of the window box and the bushy, upright plants in the center and back.
Bleeding glorybower (Clerodendrum thomsoniae) is an evergreen vine with 5-inch leaves; the vine can grow up to 10 feet long. This plant produces showy red and white flowers in the summer and fall. Keep the soil moist and never allow the roots to completely dry out. Trim the ends of the stems to keep the size manageable.
Blue passionflower (Passiflora caerulea) is a deciduous vine that produces climbing tendrils. This summer flowering vine produces blue or white blossoms followed by an edible, orange-colored fruit. This vine can reach 12 feet long, so pinch back to the desired length.
Common Morning Glory
Common morning glory (Ipomoea purpurea) is a twining vine that grows up to 15 feet long. This draping vine produces white, pink, red, blue and variegated colors in the summer and early fall. Morning glories are invasive so a window box is a perfect way to control its growth and enjoy the large blossoms. Keep the soil on the dry side for good growth.
Iceplant (Delosperma cooperi) is a low growing succulent that reaches 4 inches in height. The iceplant produces long-blooming, rosy-purple, daisy-like blossoms. Each flower has a yellow center and sits on top of the dusty-green leaves. This plant prefers soil on the dry side and will bloom all year round if located in a warm climate.
Sweet violet (Viola odorata) is also known as English violet. Sweet violets grow 5 to 8 inches high, thriving in moist, cool soil. The fragrant blossoms are deep violet in color and loom over heart-shaped leaves in the early spring. Sweet violets enjoy partial to full shade in warm climates.