Covered with or having bracken, a common fern, growing on it or throughout an area.
From 'bracken' (itself of uncertain origin, possibly from Old Norse 'brakni'). The past-participle form suggests something that has become overgrown with this fern.
Bracken is so tough and spreads so aggressively that hillsides can go from diverse meadows to solid bracken in just a few years—it's a botanical takeover artist!
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