Where to start!
The very first thing I learned many years ago was that ginseng doesn't live long in a sunny spot by a big maple tree.
As for the spacing, in my wild sim beds I am spacing maybe 6 to 8 inches. I don't pay attention and just plant when I\"m doing it. I use my seeder and plant in a semi circle in front of me 1-5 seeds per hole (too much time to be more careful than that) and holes 6-8 inches or so apart. Then, I step up maybe 10\" or a foot or so and do it again. All of my wild sim plantings are exceeding my expectations. If I had to guess, my oldest bed being 9 years old now, I have likely about 70-80% survival. It has been naturally reseeding itself for the last few years and there are many seedlings and smaller twos and threes under the big mature three and four prong plants I planted there.
I've had only minimal success with the rake and scatter method. I'm sure I'm just doing something wrong the times I tried it, and if I were to try it again now knowing what I do, the results might be better. But I don't like that method if it can be avoided.
I\"ve learned that replant failure is indeed an issue. However, it seems to be linked to worked ground. I don't know if rake and scatter plots would experience this phenomenon or not, but I know my tilled beds do and the commercial farms certainly do. I\"ve not noticed any replant issues when reseeding over a wild sim spot.
I've learned that when I have an exceptional bed of 2s or 3s, I shouldn't dig them all for sale as I'll kick myself for doing it a few years later! lol
I regret not planting a lot more wild sim early on once I got the hang of growing ginseng. I would be harvesting premium roots right now if I had.
I've learned that straw works in the woods. I've spent a lot of time with a shredder vac sucking up leaves for mulch on the beds only to have them blown clean. When I put on 2-4 inches of clean straw, it stays on the beds and does a better job. However, if its not clean you have a weed problem, and if you get it too thick you get a rodent problem...and you might anyway. Straw is MUCH faster as well. These days, that is a big issue for me. However, it stands out like a sore thumb in the woods the first fall until snowfall.
Also, I agree with 5prong....maintenance (spray and weeding etc) will increase your survival rate the first few years. That seems to be the critical point for ginseng. Once they get past the first July, they are half way there. Once they get to the end of their third year, the odds are they will do just fine there on out. Certainly a few will succumb, but you will start finding plants where you thought there were none also some years.