Seems like you're only supposed to spray haygrazer when it's quite young. Like 6 to 8 inches tall. Once it matures it is quite sensitive to herbicide collecting in the whorl. It may be ok if it's been grazed down, idk. Usually it grows fast enough to out compete weeds. Sorry it's not better info. But I would use caution,
according to Penn State: "Apply to sorghum that is 6 to 15 inches tall prior to boot stage. Use drops if taller than 8 inches. Crop tolerance decreases as size increases. Do not harvest or graze for 7 days"
