Geez, Pine Island sure is shipping some tiny trees. As for growing in the ground, first, pull back thst hay immediately, you dont want those crown roots covered. I hope its not planted too deep (I cant see the graft). Wait, scrap those instructions, save the tree's life znd dig it up now (the root ball should still be fully intact as long as you didn't break it up, and hopefully you didn't ), put it vack into that 3 gal pot, let it get larger. And eventually bump it into a 7 gal or 15 gal pot either much later this year or next year.