I agree maidenhair is probably one of the best if not the best companion plant when finding wild ginseng. Jack-in-The-Pulpit, Trillium, Blood Root, Yellow Root, Green Dragon, Jewell Weed, Twin Leaf, Wild Yam, Wild Ginger, Black and Blue Cohosh, Baneberry and Mayapple are all good at times but do not always produce ginseng growing near by. Maidenhair must love acidic soil. I find it in Eastern Ohio near my property with the ginseng. However not in large quantities like I have seen in your fellas pics. I do not see much of it here in central Ohio thou.
I have to say my favorite indicator plant is the \"Spice Bush\" understory woodland tree. Google it and you will see what it looks like of you are not familiar with it anyone. The bark, leaves and red berries are all useful in many ways too. I remember a post a while back where a fella on Wildgrown.com once said \"Does anyone know what that little bush is in the woods that has red berries on it. If I find this tree I normally find ginseng\".
Here is a pic I took last weekend when I sent that pic of my 2 and 3 year old plants. These ferns were on a North East facing hill. I planted some seeds just up the hill from this beautiful patch of wild fern. It is a pretty dense patch of fern and nothing else is growing in the entire patch as it is very thick. I am not sure what kind of ferns these are either.
Latt