Make it mobile, self-watering, and low maintenance, too, and you have their best-selling rolling. It saves you time and money by watering your plants for you, keeping them healthier, and reducing costly over-watering and plant replacement. Covered with flowers or vines, it makes a convenient and attractive privacy screen. Roll it to where you need it, just unlock the casters and push the planter to the desired spot. A planter with wheels is so convenient. It has a built-in 2-gallon watering system with a handy water level indicator. This sub-irrigation system ensures your mature plants will always have the water they need, even when you're on vacation or during hot, dry weather. And you'll easily know how much water they have and when it's time to refill.