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Catkin development

Sometimes - though not always - catkin development can be used to gauge readiness of female flowers. Here, the top catkin is "not bushy" (anthers/pollen not out), which generally indicates the female flower is not ready for pollination. The bottom catkin is "bushy" (anthers/pollen out), which is generally an indication the female flower is receptive for pollination.
Catkin development
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