Typical swarm locations
Sowerby Bridge collectors attend swarms in the riverside alder and bramble of the Calder valley floor between Copley and Luddendenfoot, along the canal-side scrub and rosebay willowherb of the Rochdale Canal towpath, in the walled garden boundaries and orchards of the older millworker's cottages on the valley sides above the town, and in the chimney stacks and stone terrace roof voids of the older streets around the town centre and Wharf Street.