The information at the link below, should answer some of the questions concerning Ginseng dormancy...just scroll down to my answer by huntsman53 to read what I wrote. I will add that Ginseng plants will go dormant for many reasons but the most common reasons are due to drought and loss of shade canopy due to logging and wild fires. I have even seen plants go dormant when we have seen nothing that could affect them at all but it happens. Many times when you dig a root that only has a 2 pronged or 3 pronged top but the root shows growth scars of plants that are 10, 15, 20, 25 or even 30 years old, the reason is because the plant was probably a 3 pronged or 4 pronged plant at one time but due to having to go dormant, they were knocked back down per see in their' prong development. It is sort of like saying that they have to almost start over due to dormancy and the longer the root and it's top or plant have to stay dormant, the worse it is on them. I have actually dug 4 pronged plants with small tops and skinny stems but according to the root scars, they were 50 to 100 years old or older. In reality, these may have been at one time in their' lives, 6 pronged or even 8 pronged plants but due to many periods of having to go dormant, they were knocked back down in their' life cycle process to 4 prongs. Heck, some of them may have even been knocked down to 3 prongs but I did not find and dig them until they had been able to recoup back to a 4 prong!
www.wildgrown.com/index.php/Ginseng-Foru...ng-kill-ginseng.html
Frank