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?
Greensand Way The Greensand Way is a long distance path of 108 mi in southeast England, from Haslemere in Surrey to Hamstreet in Kent. It follows the Greensand Ridge along the Surrey Hills and Chart Hills. The route is mostly rural, passing through woods, and alongside fruit orchards and hop farms in Kent and links with the Stour Valley Walk near Pluckley in Kent. The trail was opened on 15 June 1980 and is jointly managed by Surrey and Kent Councils who fully updated it in 2012 (route, waymarking, online guide).
Rosa hemisphaerica Rosa hemisphaerica, also known as the sulphur rose, is a rose species with pale yellow flowers native to western Asia. The wild form, known as "Rosa raphinii", has single flowers with five petals. A double-flowered form was one of the first yellow roses introduced to European gardens; John Bellenden Ker Gawler stated in 1815 that the species had been cultivated in England for nearly 200 years. The scent of the flowers has been described as unpleasant.