Question: What plant do flowers  used primarily as a flavoring and stability agent in beer that are grown on  long distance path of 108 mi in southeast England, from Haslemere in Surrey to Hamstreet in Kent?
Sentence (from "Hops"): They are used primarily as a flavoring and stability agent in beer, to which they impart bitter, zesty, or citric flavours; though they are also used for various purposes in other beverages and herbal medicine.
Relevant evidence: Yes