Originally Posted by PR-Giants

Anyone that's been in a greenhouse has seen how roots behave in a zone of high humidity. Replicating that in a pot of coarse sand is very simple and can be accomplished with many different materials. I prefer a material that can be placed on top of the coarse sand and is easily molded to shape, retains high aeration levels (which means it has structure), retains a high moisture level for an extended period of time, is biodegradable but doesn't degrade quickly, and provides a perfect environment to promote maximum root growth.