Coco coir or rockwool? Elliott Gorfain has spent 27 years in controlled environment agriculture, and
in this episode he breaks down every grow media a commercial cultivator can buy, what each one
actually does to your root zone, and how to pick between them without wasting a season finding out.
Growing media quietly sets your irrigation strategy, your labor cost, your freight bill and your
nutrient control for the entire run. Most growers pick it on habit. Elliott walks through the nine
things that should actually drive the choice, then goes media by media.
IN THIS EPISODE
- The nine factors that should decide your grow media
- Why roots need oxygen more than water, and how overwatering kills
- CEC explained: why high CEC helps coco and zero CEC is the point of rockwool
- Loose fill vs compressed blocks, and the rehydration catch
- Why unflushed coco carries sodium, and how a CalMag flush fixes it
- How rockwool was invented by accident at an insulation factory
- Why freight is 20 to 25 percent of bulk peat moss
- The one growing media Elliott says never to use
- Aeroponics, ebb and flow, buckets and deep water culture
- Why commercial farms run top down drain to waste
Episode 6 of Growers MBA by Green Thumb Depot.
Shop growing media and talk to a real grower about your facility: https://greenthumbdepot.com
New episode every week.
