Typical swarm locations
Collectors around Alston attend swarms in the mature sycamores and ash trees of the market place and the Townhead terraces, in the walled gardens and outbuildings of the older lead-mining cottages, along the South Tyne riverside hawthorn and willow scrub below the town bridge, and on the upper heather-moorland edges toward Nenthead and Garrigill where colonies are sometimes kept for migratory heather work.