Our correspondent was unable to attend this one (on assignment elsewhere) so the account, and one picture below, are taken from volunteer Doug Bosco's FB post.
The main targets of the day were the insidious reed canary grass and equally insidious non-native thistles, and their fate was an appropriate, if somewhat medieval, one; beheading. Doug's caption on his post, "Off with their HEADS", only hints at the fervor which volunteers muster up on these hunts.
Unlike those medieval tyrants, we don't leave the severed heads on a pike as a caution to future miscreants. Instead they are either composted on-site or bagged for later disposal elsewhere.