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Pinus strobus needles have deciduous sheath

Quoted from Wikipedia - Pinus strobus: "Like most members of the white pine group, Pinus subgenus Strobus, the leaves ("needles") are coniferous, occurring in fascicles (bundles) of five, or rarely three or four, with a deciduous sheath."

Does that mean that the plant renews the sheath/skin of the needles annually?

Is that the reason for the needles turning yellow in fall?

Anyone wants to elaborate?

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