Complete your window box or planter with our GrowBrownie irrigation system from Windowbox.com. Not only does this sound delicious (do not eat!), it really works. This is an advanced sponge-like material that is a growing medium made from coconut husks and tree bark that has been composted, and a patented polymer that forms this firm yet absorbent material. This GrowBrownie will soak up extra water in your window box or planter, up to 8 times its weight. The water will remain in this growing medium until the plant roots are ready, and the moisture is wicked from the GrowBrownie into the plant. This is all about watering your plants at the right time and the right amount - the GrowBrownie does it for you, eliminating all the guesswork. Use GrowBrownies at the bottom of your window boxes, planters, or on a living wall. Windowbox.com can also customize GroBrownies for commercial projects as well, give us a call for an estimate at (888) 427-3362.