I was reading about these about a month ago, but I put it out of my mind until recently when I saw one.
It's a freak of nature - disease, deformity - that causes a woody plant to have an unusually dense patch of growth that looks similar to a nest or, in the case of some trees, the end of a witch's broom. They believe it may be caused by organisms introduced into the plant because when a piece of a witch's broom is grafted onto a healthy plant that formerly healthy plant goes nuts and gets its own witch's broom.
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