Tested it, good so far, but the random balance needs tweaking. Currently on hand 20+ berries, 20+ herbs, 30+ crystals, and still not a second mushroom. =_=
Yes, and that's where I'm farming them. The corner icons show what each area drops, I'm aware. And I'm still getting apples and herbs constantly, with no mushrooms.
Just buy them from the grocery. You unlock it by visiting the gate a few times, and can buy most alchemy ingredients there, and it will restock with any time pass