I see many players posting that their seedling they are sharing came from a specific orchard full of specific trees, and then when people grow them, they are disappointed that the seedling they got, that was said to come from an Acai Orchard, turned into a Golden Plum and not a Peach Palm. So here is how the Mystery Seedlings work.
1) There are 2 types of Seedlings, but both are called mystery seedling. Type A is the seedling that you keep, this is going to be the Level 2 tree of some tree in your orchard, If you have a solid Orchard of 1 Type of tree, then you will have that trees Level 2.
Type B is a seedling picked up off the feed, these are wild cards, they can be anything that's a Level 2 tree. And yes If someone Harvested an Acai Orchard, and posted the seedling, claiming it came from an Acai, it is possible you will grow a Peach Palm, but its more likely you will grow something else.
So the short version is: On Mystery seeds posted to the feed, it is a mystery what it will be, it does not matter what orchard it came out of.
This information will likely change once the level 3 trees show up, but that may be a long time away.
Quit disappointing your friends, quit posting that the seedling you shared came from a "_____" Orchard. It doesn't matter Share this so people will know the truth!