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. Maintain the plants.
Window boxes require frequent watering-often daily in hot, dry weather.
Soak the soil completely at each watering. 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. 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 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.