Data from longleaf pines (Pinus palustris MILL.) in central Louisiana show no relationship between date of maximum Hower receptirvity and cone maturity. The time required for seed development on individual rtrees is constant, but varies as much as 4 weeks between trees. Among trees, the order of cone ripening is highly correlated from year to year, suggesting this variable as a basis for ranking trees in priority of cone harvest.
McLemore, B. F.; Derr, H. J. 1965. Longleaf pine cone maturity is independent of pollination date. Silvae Genetica. 14(4):133.