My property is in the MFL. Can it be considered a farm for Tax Exempt status to purchase items needed to maintain the property and purchase new nursery stock?

I believe you are asking about Wisconsin's Managed Forest Law Program.  If so, the MFL may be a consideration for tax deductions especially if one of your stated goals for owning the property is "for profit". Generally, it is best to seek this type of advise from your tax specialist.  

This website has professionals nationwide.  Not sure what MFL is.  If you have questions specific to a state program you should contact that agency, or a tax expert with your local extension service.