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Southern Heart Pine, or “Heart Pine” as it is sometimes called, refers to the heartwood of mature Southern Yellow Pines. Southern Yellow Pine varieties include Loblolly Pine, Slash Pine, Shortleaf Pine, and Longleaf Pine. All of these varieties have a good size heartwood content at maturity. Southern Yellow Pine has been widely available in the southern United States since colonization. However, it was not until after the Civil War that major lumber production began to take place. During the late eighteenth century and the early nineteenth century, the South was producing nearly half of all timber being cut in the United States. Much of that timber was Southern Yellow Pine, and in particular, Longleaf Pine. Southern Heart Pine is not remarkably difficult to process. The one difficulty with “Heart Pine” presents itself when it is installed unfinished and requires sanding. The abundant resin found within the wood can cause some difficulty during the sanding phase. This can be counteracted with frequent changes in the sanding paper.