The IDOT Class 4A (Low Profile Native Grass Mixture) is a standardized seed blend specified by the Illinois Department of Transportation for establishing a sustainable, low-maintenance native prairie in areas where vegetation height needs to be kept shorter than the standard Class 4 mix.This mixture is ideal for locations such as medians, near sight lines, or urban areas where the tall growth of grasses like Big Bluestem and Indian Grass might be undesirable.