Clever Self Watering Systems

Transplanted trees and shrubs often struggle along for several years before they start to show much growth. The most common culprits are under-watering and over-fertilizing. These Water Rings are the solution to both problems. The five-gallon reservoir prevents the dry-out that stunts growth, and you can add fertilizer a little at a time to promote strong root development.
Can be found here: gardeners.com