From July well into fall, many thousands of fireweed seeds will be passing by, high overhead. When it’s windy, they fly, when it’s calm, they hang almost suspended. The feather-light seeds descend only when there’s no air movement whatsoever. They slowly drift down and from 100 m up, it takes 25 minutes to reach the ground (exceptions include downdrafts and rainfall). ~ Fecund Fireweed’s Far-flung Seeds
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