Urban Garden Towers

I recently was walking to the park with my 3 year old when I noticed a very interesting tower of plants on a neighbors porch that had all kinds of food growing on it. It had lots of different Shard and Salad Leaves. Every day I passed by I hoped I would meet the people who were doing something so awesome. I did today. So basically they are PVC pipes and they use aero dynamics to grow and nourish the plants. All you do is fill water, check the PH and add nutrition and voila you have food (with no soil - just air and water) WOW.   The towers looked like this..