Our design team nailed it with this one! This clever system adapts to practically any planter. 15 3 4" fully expanded, it compresses down to 8". The fill tube is height adjustable too, so you can use Honey Mesquite Care: Learn About Honey Mesquite Trees In The Landscape Gardening Know How Happy Frog Potting Soil from FoxFarm (2 Cu Ft) The Bigger the Lily Bulb Ampersand Bulb Co. Growing Zucchini Squash in Containers at Home Easily Making Your Own Cactus Soil On line Guide to the positive identification of Members of the Cactus Family