I talked to several foresters this past month that were supervising tree planting.  Southern forest are a renewable resource. That’s another good reason why land is such a good investment. As a general rule, pine seedlings should be planted before the end of March. The soil needs to be rather cool with adequate moisture. A chemical release is always a good idea 1 or 2 years after planting to eliminate competition.  If a final harvest has occurred close to planting  season, it may be best to let the land “lay out” and re-plant the following year.