Pollen dispersion and frequency of flowering were studied in the natural population of Pinus roxburghii Sargent (Chir pine) at altitudes between 1600 and 1900 m above sea level in the Tehri forest division of Garhwal Himalaya. Temporal variations for pollen cone and male strobilus production were observed with a year of bumper production. An individual tree produced 14.96×1011 ± 2.64 x 1011 pollen grains with a range of variation in the population between 12.95×1011 and 19.09×1011 pollen grains. Dispersion of the pollen grains from the fringe of the forest declined sharply with distance. The results implied that a segregation barrier of 640 m would be the minimal distance for the management of a Chir-pine seed orchard at the study location.
