What's the best weed killer?

[Aftermath]

sirhrmechanic 's anecdote about the piece in the free dirt is testimony, somebody may know a chem free way to get rid of it but I don't

Post numba 12.
Fiwa.
Even better if you go ahead use some chems first, preferably hydrocarbons in abundance. Let them there hydrocarbons soak in good n plety for 24 hours and apply a second coat when you open the beer tomorrow. Let that soak in for about an hour while you and Roscoe have another 6 pack. Back up a bit and toss a smoke bomb at it you lit from the Camel filter.
Sorta like brisket...it takes a good smoke to get it right.
Extra points if you do this on the day we celebrate casting off the tyranny of the King.

 

[Thumper580]

ACTUAL glyphosate... 41% or stronger... Mix it yourself in a 1 gallon garden sprayer...

I guess "roundup" isnt glyphosate based anymore...

The other thing would be 24D, again mixed yourself. Its broad leaf weed killer. Less harmful to you than glyphosate. Works on weeds. Doesnt work on grass.

All of these things that are "super bad for you" and whatever, sure, if you are broad spraying on tons of land... but spot spraying weeds... meh. We have some stuff thats "kinda banned" but definitely frowned upon because it has arsenic in it. Sure its really bad if you are spraying it on a hundred acres, but I mix 1oz per gallon and treat 20k sq. ft. as I spot spray johnson grass and crab grass. Im not to concerned.

Tractor Supply sells it at about 63% if I saw it correctly.....

 

[Pharmseller]

RoundUp no longer contains Glyphosate 41% and when it did, it didn't contain pure Glyphosate 41%. If you mean don't dilute the commercially sold premixed RoundUp, that makes sense. Crossbow contains 2,4-D 34.4% and Triclopyr 16% and the strongest mixture from the label is 5½oz/gallon and it costs $55 per gallon from my CoOp. I'm guessing you don't apply herbicide per acre in an agriculture setting.

4 gallon backpack sprayer. Use however much Roundup (I buy the big jugs of concentrate) for 4 gallons. Then add however much Crossbow for 4 gallons, using the hard to kill recipe.

Kills everything.

I don’t apply herbicide in an agricultural setting. That’s not what the OP asked anyway.