The Hydro Cup Watering System supplies a constant and even amount of water, down into the soil, where it gradually spreads to the roots of plants in vegetable beds, raised beds, or large containers. It comes with four terra cotta watering stakes, to drive into the soil, and four cups with detachable lids. Fill it with a hose, or allow it to fill with rain water on wet days. It will form a reservoir to continue delivering water even after the shower passes. It takes 10-14 days for the reservoir to fully drain. The reservoir is 2.5L (0.66 gallon), with a width of 17cm (6.7") and a fully assembled height of 46cm (18"). Great for weekends away from the garden.