Why use the vertical grow rack system? The most important factor is: there will be less land for farming and the commerical growing space will be more expensive. Thus our GK vertical grow rack system is what you need for farming. Grow racks with Tier 2, tier 3, tier 4 for more crops at the limited growing space. And every rack can have its own irrigation, ventilation, lighting, and remote monitoring systems for a perfect yield every grows cycle.