How do garden centers keep their hayrack window boxes so lush? We’ve discovered the secret: AquaSav™ Window Box Liners. Developed for the commercial nursery trade, these smarter window box liners require 50% less watering than standard liners. Sandwiched between layers of natural coir fiber is a water-retaining liner made of 100% recycled post-consumer plastic. It’s a lifesaver for flowers, especially if they're exposed to both sun and wind.