I purchased land this year to grow trees should i show this as a farm or business using a schedule c

Agriculture is considered farming, so you would report the activity of your tree farm on Schedule F.

If you purchased land, but have no expenses for the year, you would not report this activity on your current tax return.

But if you had expenses relating to preparing the land for planting, or buying seedlings, you would report this on Schedule F. Even if you had no income for the year, check the box for "I have income from operating a farm" at the beginning of Schedule F. You can report a loss in your first year.

The easiest way to find this area is to open your return and use the Find/Search box at the top right of the TurboTax header. Enter "farm income", then click on the "jump to farm income" link.