Board Thread:FarmVille (game discussion)/@comment-65.185.91.186-20130527072138/@comment-8111497-20130528171431

The only trees that give the Maple Syrup bushels are mentioned here... you will also find reference to other similar bushels:

http://www.farmvilledirt.com/2012/05/crafting-bushels-how-to-get-them.html