If u think u need to do extra…. Winter rye. Or if u wanna get nuts…. Transform from RCG to a waterway mix without RCG. Kill and drill that.Anyone successfully transformed RCG to switchgrass in waterways? Little scared of window of erosion from termination of one to establishment of next. Maybe with adding rye....
Now- RCG is very aggressively rooted and matted. That has a very good chance of holding for a year. U may have some issues but probably not major. Unless it’s very steep - which usually RCG doesn’t grow in that anyways. I think good chance of converting.
last 2 cents…. I might only do this on a farm really needing cover. Add switch to other areas. Leave waterways if it’s holding soil. In SOME cases, the small gain of cover with waterways is not beneficial enough to off-set the risk of having any issues of NWSG’s not holding the soil as well as a sod forming grass… I leave most of mine in brome, or western wheatgrass. Or ideally- a mix like fescue, brome, red clover, etc. having a strip of switch on both sides of waterway would also be pretty cool.