Of course, hops don't restrict themselves to hop gardens, and wild - or perhaps feral - hops abound in many hedgerows (and now growing vigorously).
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Many hedgerow hops are male, unlike the ones with the cones in the hop gardens which are all female, and historically these self-sown plants would have been removed by local growers since unseeded hops could command a premium.
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However, there can be serendipity here too, such as the new variety of wild hop discovered in Sussex and now used by Harvey's for one of its brews: Wild Hop.