They have coated the substrate Symbiotic Micro organisms in spore form.
These organisms will live on and in the plant root systems and "work'' with bacteria to enrich the growth of plants. Root symbionts are bacteria that have a symbiotic relationship with the roots of plants which (in this case?) aid in the absorption of nutrients.
I cant take credit for the answer. You can thank DeLaFe and Comet
Where did you order from, about to order some from amazon
Last edited by andrewq; 07-16-2013 at 10:20 PM.
Reason: more info