What does Zone do? Morgan December 12, 2016 01:55 Zone maintains optimal root zone conditions for maximum nutrient uptake by reducing pathogen populations guaranteeing clean white, healthy roots! Related articles How do I use Zone? What does Trich-XL do? Has the Commercial Edition range of products been tested on cannabis? Which product replaces Liquid Light as a foliar spray? Comments 0 comments Please sign in to leave a comment.