only 1 use
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- No tree grew there, only rough grass and many tall plants: stalky and faded hemlocks and wood-parsley, fire-weed seeding into fluffy ashes, and rampant nettles and thistles.1.6 -- Book 1 Chapter 6 -- The Old Forest (24% in)
There are no more uses of "rampant" in The Fellowship of the Ring.
Typical Usage (best examples)