Utilizing these Hydroponic Tower System Kits, one can grow 2 acres of plants in 1/4 acre of greenhouse space—and usually faster (e.g., strawberries bear in 6 weeks in spring, 8 weeks in fall). Each kit consists of stackable pots that rotate, swivel plates, premixed growing media, a 4- to 6-month supply of fertilizer, a pump, a timer, and a drip irrigation system. A "tower" takes about 10 minutes to set up. The system can be used outside as well. Large or small commercial systems are available.