Clethodim Question


5 year old buck +
I have two small clover plots. Mostly Durana. There is a lot of grass invading these plots. Does the grass have to be actively growing for clethodim to work? It's getting to be that time of year when the grasses seem to slow down quite a bit. Would it be better to wait till spring? I've never used clethodim before and it's a little pricey so I don't want to be wasting it.
What is the difference, if any, between an 80/20 surfactant and COC?