Straightness

Unimproved loblolly pine is very crooked. Tree breeders have had a major impact on improving the straightness of most families. The S rating is our estimate of the percentage improvement in straightness above unimproved loblolly. An S grade of A or greater would be for a family with excellent form. If the S grade is C, then the straightness would be slightly better than unimproved loblolly pine.