A leafcutter bee nest block surround features a set of separate backing members and a set of separate side members connectable thereto in useful positions extending away from a common plane shared by the backing members and spanning along respective sides of a nest-block receiving area of the common plane. Each of the side members has a coupling end connectable to one or more of the backing members and a distal free end opposite to the attachment end. Each side member, at the attachment end thereof, comprises a coupling feature that is cooperable with a mating coupling feature at the perimeter of one or more of the backing members to couple the side member to the backing member in the useful position. The nest surrounds can be flat packed for efficient transport and storage and easily assembly through mating of the coupling features without external tools or equipment.
