Just want to add, as others have said, that if planting more densely, greatly increases the need for constant care! Keep in mind, with Larry Harding, that ginseng is all the guy does and he hires help. He is not holding down another job and trying to do ginseng a a sideline like most of us. Even then, I am sure he puts in some very long days tending his plots. These are things to consider, when planting because you all know how hard it can be to find the time to \"take off for a walk in the woods\" let alone plane on a continual regiment of spraying and care. And, as others mentioned, those viruses and fungus's don't take a day off. You miss one spraying a couple years into some nice plants and your whole bed could be ruined. JMHO. Have a good one