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Weeds

I have a planting of native grasses only which I planted in early summer.  Do to heavy thistle and other broadleaf weed populations I opted not to add forbs this year.  Besides the thistles,  I am particularily concerned about a sour dock seed bank and others which I know only by a common name.  I call the one 'marestail" and another "wild lettuce".  What I would like to know is if anyone knows the life cycles of the marestail and dock.  Marestail typically infests new plantings the second season in this area.  (Central Iowa) and I think dock does too.  Will these plants emerge this fall to overwinter and produce seed next summer and fall or will they not emerge until next spring?  If they emerge this fall, could I spray the area with Stinger or something to kill them with the thistles and then late fall or winter safely without residue concerns, do a frost seeding of forb species?
 
Thanking you in advance!
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