Hello thank you to fellow player about the mystery box post. Dang it i found out the lemon tree i never got and missed out on. It was discontinued in 2014. Just passing along to anyone else. Thank you for help.:)
Like the first replier said, you can still get the Lemon Tree in the game only from the new mystery box but you have a 6.2% chance of getting it from there which makes it the third most difficult item to get in the mystery box. First and second is 30 donuts and Lard Lad Donuts.