What is the most common type of grass used to construct sod houses?

The most common type of grass used to construct sod houses is Buffalo Grass. This grass species thrives in the prairie regions of North America, particularly in the Great Plains where North Dakota is located. Buffalo Grass is well-suited for sod construction due to its dense root system and ability to hold soil together, which provides the durability needed for building materials. Sod houses, also known as "soddies," were particularly popular among settlers in the late 19th century, as they were a practical solution in areas where timber was scarce.

In contrast, other grasses such as Blue Grama Grass and Prairie Grass, while also found in North Dakota, do not have the same robustness or suitability for building purposes. Timothy Grass, primarily used for forage and hay production, is less prevalent in the construction of sod houses. Therefore, Buffalo Grass stands out as the preferred material, given its properties and historical significance in the architecture of the region.