Recently went to the AGA 2017 Convention, where I had a bit of time to discuss some of the CaribSea products with the rep. Which I love the substrates and he mentioned that the newest addition to the Eco is Floraspore™ which is Mychorrizae varieties which cause the roots to branch and create a much stronger root system.
It has been used in agriculture for a hundred years. Since so many aquarium plants are already grown emmersed, I would imagine they are already using these in the green houses.