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The ability of an evergreen to hold on to its needles is what is meant by the term "needle retention."
Specifically, evergreens do lose their needles. It is just that they lose their needles, which are leafy equivalents, at a slower rate and over a longer period of time. Generally, evergreens tend to replace their needles within a three-year period.
Additionally, the term may refer to the ability of an evergreen to retain its needles once the trunk has been severed. This is a particular concern in regard to Christmas since customers prefer not to buy evergreens that quickly and massively drop their needles once separated from their roots.
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