Which species is mentioned as a contaminant in crop seeds?

KR Bluestem is mentioned as a contaminant in crop seeds because it is known to be an aggressive invader that can spread rapidly and outcompete native vegetation and crops. This grass species, when mixed with seeds for crops, can lead to unintended growth in agricultural fields, creating challenges for farmers and impacting crop yield and biodiversity. Managing such contaminants requires careful monitoring and prevention strategies to ensure that seed mixes do not include invasive species like KR Bluestem. Understanding the implications of introducing such species into the ecosystem is critical for agricultural management and conservation efforts.