The Fiberglass "Supreme" Window Box with built in water reservoir is an upgrade from our basic Fiberglass Supreme window box as it offers a pre-formed cavity at the bottom of the box that holds water and allow the plants to "wick" water as they need it. Depending on your climate and region, some owners can go 2-3 weeks without watering. Ideal for hard to reach windows and for frequent summer vacationers, this box is very convenient. This box is not available in custom lengths and comes with special mounting brackets and bolts that hold the box to the wall via a lip on the back of the box.
