Pro-tip: During year 1, try to leave a bunch of trees to grow and spread on the farm. My favorite map is the 4 Corners, and I'll leave an entire quadrant to get just full of trees. It gets to the point that you can't even walk through it without an axe and/or scythe to take out the little trees to make a path. Then in the fall, start watching, because that's mushroom season. (I don't want to spoil the mechanics, but you need trees, and the more you have the more likely you'll get a mushroom tree in the Fall.) I will give it a few days and then go exploring my mini-forest, looking for that mushroom tree... and when I find it, that's when you clear out all the trees around it, and I mean ALL, so it can spread. I will, over the course of a couple days raze the whole quadrant to the ground. Then I encourage it to spread by keeping things that way, except some path/flooring where I don't want it to spread to.Good thing as I can't seem to get a mushroom tree after almost 6 game years.