I bought a 2.5-gallon jug of 46% glyphosate for $55 bucks from Tractor Supply recently. That’s enough to last me for many years. Beats the pants off Round-Up for $20 a quart.
The same stuff just doesn’t have some of the fast-acting salts added to the Round-Up formulation. Kills em dead, just a little slower.
Oh, and I have a mosquito fogger too! How on earth am I still here?
Usually the commercial variety will also have a surfactant which helps the product stick to slippery leaves and become rain fast.
You can buy Surfactant separately and add it - just a tiny bit goes a long way - less that 1/8 oz
How fast it works depends on the brand - some are better than others - but avoid the powdered varieties. Also depends on the temperature and percentage you mix ; cold weather: 50-75deg would be 8-6oz gal, 75deg -up, 3-4oz gal; also mixing some Amine 400 2, 4-D in equal proportion seems to help take out those pesky tree seedlings that pop up in the early spring. Low percent Amine 400 2, 4-D does not kill grass. 6oz in early spring when chilly and 2 oz in summer per gallon.