Windowsills can offer ideal light conditions for house plants. This windowsill sized self watering tray works great as a holiday watering system. Once filled with water it will keep potted plants watered for up to 14 days.The unit features a base reservoir tray which contains a 'stilted' inner support platform which is covered in capillary matting. The base tray provides a reservoir of 1 gallon of water. By ensuring the exposed compost at the bottom comes in contact with the capillary matting the plants will water themselves!