This plant was supposed to have magical properties in medieval times and was used as a potion against various diseases but also for keeping witches away: "Vervain and Dill hinders witches from their will".
It doesn't seem to me to be very common in the north west of the country and Stace reports it as locally frequent in the South.
Llandudno West rocks, 5th September 2004
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Added on November 8th 2004, amended on February 5th 2005