S.C. Code Ann. § 15-67-250: What constitutes adverse possession under claim of title not under written instrument or court judgment or decree.

For the purpose of constituting an adverse possession by a person claiming title not founded upon a written instrument or a judgment or decree, land shall be deemed to have been possessed in the following cases only:

(1) When it has been protected by a substantial enclosure; and

(2) When it has been usually cultivated or improved.