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Combine flowering plants and those with attractive foliage in window boxes to add color to decks, window sashes and porch rails.
Tools and Materials
- Window box
- Potting mix for containers
- Water source and watering can
- Plants with attractive flowers and foliage
- Flowering plant fertilizer, water-soluble
Design Principles
Mix plants with trailing, spiky upright, and "fluffy" growth habits, as well as large, medium and small leaves. Choose a color scheme or color combinations that complement your home or landscape. Red, yellow, orange, bright pink and white look good from a distance, while blue, purple and dark green show best at close range.
Selecting Containers
Choose containers that fit your decor and available space and are at least eight inches wide and deep. Be sure they have drainage holes or plan to drill your own. If mounting under a window, use a box that is a couple of inches smaller than the width of the window for best appearance.
Add potting mix. Purchase a sterile potting mix containing peat, perlite and other ingredients that improve drainage, aeration, fertility and water-holding capacity. Consider using a water-absorbing polymer to decrease watering frequency. Fill your window box about half full with the potting mix, and add water to moisten the mix if it's dry. Do not use regular garden soil.
Adding Plants
Plan to set plants about two to five inches apart in the box, depending on their mature size. Slip plants out of their pots without pulling on the stems, and gently untangle any circling roots. Set the tallest plants, such as geraniums, in the back of the box. Let the trailing plants, such as lobelia, hang over the front and sides. Fill in with the fluffy plants, such as pansies or impatiens. Fill the spaces between plants with soil mix, tapping gently. Water thoroughly to settle the soil.
Maintaining Plants
Window boxes require frequent watering — often daily in hot, dry weather. Soak the soil completely at each watering. Use a water-soluble flowering plant fertilizer dissolved at one-quarter strength once a week or according to package instructions. Trim dead flowers and straggly growth and replace plants that perish or look ratty. Remove some plants if the box becomes too crowded or requires watering too frequently.
Tips
Test color and design combinations at the garden center by mixing and arranging potted plants before you buy them.
Anchor boxes securely under windows with galvanized L-shaped brackets screwed into wood or masonry. On decks and porches, hang boxes from brackets that drape over the deck railings.
