Could you get a closeup of the seed head? It looks like a lot of weed grasses at that view point. Having said that, the three way mix of Acclaim, Turflon Ester and Tenacity is a possibility. Or test out Pylex.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738