Hear is a good site for you to research:

https://www.timbertax.org/getstarted/structure/treefarm/

Also see pub 225. Here is an excerpt:

Forestation and reforestation costs. 

You can elect to deduct up to $10,000 ($5,000 if married filing separately; $0 for a trust) of qualifying reforestation costs paid or incurred after October 22, 2004, for each qualified timber property. Any remaining costs can be amortized over an 84-month period. See chapter 7. If you make an election to deduct or amortize qualifying reforestation costs, you should create and maintain separate timber accounts for each qualified timber property. The accounts should include all reforestation treatments and the dates they were applied. Any qualified timber property that is subject to the deduction or amortization election can't be included in any other timber account for which depletion is allowed. The timber account should be maintained until the timber is disposed of. For more information, see Notice 2006-47, 2006-20 I.R.B. 892, available at IRS.gov/irb/2006-20_IRB/ar11.html.