Hey, what would you use to kill off an established patch of Vinca Minor? I was thinking probably just Glyphosate with surfactant would do the trick. My usual backup for something that Glyphosate doesn't work on (around here, that would be Blackberries, Horsetail and Ivy) would be Crossbow. But we'll be doing this job in August and it will likely be too hot to apply Crossbow. So I was hoping that either Glyphosate [with surfactant] alone or maybe Glyphosate mixed with another herbicide (dyquat?) would do the trick. Any recommendations?