By accident we figured out 25-year ago that rocks can grow plants without soil and fertilizer. Since then, we have been tinckering and have amassed a set of university partners to share geological agriculture - the study of growing plants in rocks without soil and fertilizers. Check us out www.tosoilless.com. Also see hundreds of photos growing in rocks on our Instragram, Facebook or Twitter @ToSoilLess. Google geological agriculture or GeoAg or gravel gardening and me Richard Campbell. 

Tomatoes growing in rocks with no fertilizers.