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postulater

(5,075 posts)

3. That's OK.

Reply to Botany (Reply #2)

Sun May 27, 2012, 01:58 PM

May 2012

They can be dormant ones.

"Jack pine cones are usually serotinous, that is, they remain closed long beyond the time of maturing. The cones may remain closed for 10 to 25 years until opened by the heat from fires or from direct sunlight as they lay on or close to the ground following logging. Some cones open during very dry weather, others may open on the sunny part of the crown, and still others may open during extremely low winter temperatures."

http://woodlandinfo.org/publications/FEM/FEM_085.pdf