KSU EXTENSION AGRONOMY eUpdate – Old world bluestems are aggressive and prolific seed producers, and do well on any well-drained soil. Today, OWBs can be seen along roadsides and are increasing in our native grasslands. The invasive nature and lower palatability of OWBs allows them to increase once established but control is possible.  KSU research shows that combinations of burning or mowing along with well-timed herbicide treatments can be effective.