The following appeared on field conservationist Bobby Whitescarver's blog.
The 12-month progression from invasive Tall Fescue to native prairie (starting from top left and moving clockwise). Photos by Bobby Whitescarver.
October is a good time to kill Tall Fescue. I like killing Tall Fescue because it is perhaps the most invasive non-native plant in North America. In my opinion it is more invasive than Purple loosestrife and Phragmites, yet why don’t we hear more about it? Not only is Tall Fescue invasive, but it is also toxic!
We used a glyphosate product last week to start killing a pasture that is predominately Tall Fescue. We are doing this in preparation to replace the Tall Fescue with native warm season grasses next spring. When the new grasses get established, we will use them for pasture during the hot summer months of July and August when the rest of our cool season grass pastures on the farm usually go dormant.
Research shows that killing Fescue in the fall results in only 20 percent of it coming back; whereas if you kill it in the spring, 60 percent of it will come back. We plan to spray again next spring just prior to planting the native grasses.
I also spray around the trees we planted several years ago because the Fescue is allelopathic to newly planted trees. That means the Fescue gives off a toxin that inhibits the growth of new seedlings. If you want to plant trees into a Fescue sod, you should kill the Fescue first.
Because of Fescue’s growth habit, it harbors mice and voles. Mice and voles eat tree seedlings. Mice and voles also attract hawks. Hawks kill quail. Introducing Fescue into our natural system here didn't work out very well.
Whitescarver is a recently retired USDA Natural Resources Conservation Service (NRCS) conservationist who spent more than 30 years working with farmers on conservation practices. He now has his own private consulting business where he helps landowners create an overall vision and plan for their land. He also works with CBF to help famers install more Best Managment Practices (BMPs) in the Shenandoah Valley. He is the recipient of a CBF Conservationist of the Year award. For more information, visit his website.
The resulting native prairie. Photo by Bobby Whitescarver.