Vacant Land Tax Lien Possession in Alabama

[BJ Crump]

Hello,

I recently acquired a few tax liens in Alabama via the county tax lien auctions.  After browsing this site and several other google searches, I can't get a clear idea of the how to take possession of empty lots and acreage. Everything I purchased was land, no houses or building of any kind.  For a couple of the lots, I've already been cutting the grass and keeping them clean for over a year now and intend to keep doing so.  Other than keeping the lots cut/clean, post a no trespassing sign with my phone number, and speaking with the neighbors, is there anything else I should do in order to show possession? 

Thanks,

Bobby