Coco fiber (coconut coil) is an excellent substrate to use when growing with a hydroponics system. Coco fiber is completely natural and very inexpensive. Coco fibers are ideal because they are great for holding water and oxygen which improves aeration for the roots. In addition, it has been known to discourage some plant diseases and help to maintain a stable PH.
Although it works to grow Salvia in just hydroton grow rocks (expanded clay pebbles), mixing in coco fiber is even better. I have had most success using this mixture:
- 3 parts hydroton grow rocks
- 1 part coco fiber
Or more simply put: 75/25 (grow rocks/coco fiber).
This mixture works for any hydroponics system that can use hydroton grow rocks. I have had great success using this substrate in a DWC bubbler system. Read more about this system here:
Basic Bubbler(DWC) System