Abstract: A culm block and a method of manufacture are disclosed. The culm block comprises a plurality of straw stalks that are “vertically aligned”, i.e., perpendicular to the ground when the block is laid flat. The straw is treated with a moisture inhibitor and/or a binder. Throughholes, which may have tubes associated therewith, are formed into the top and bottom walls of the culm block. A lath or external strapping sleeve is wrapped about the front, rear, and side walls of the block for added structural support. The method of manufacture may include sorting the stalks according to length, checking the stalks for moisture content, and drying the stalks depending upon their moisture content prior to compression and formation.