You can get a total vegetation ground sterilant called "Barren" that will kill everything you spray it on and keep it down for up to a year. This stuff will "Take it down to the dirt!"
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Non-Selective Herbicide With Yearlong Residual control: A granular, non-selective herbicide and weed killer that kills all annual and perennial weeds and grasses. Including all vegetation.
The best kill potential of any herbicide is a total vegetation killer which also has a residual effect stopping regrowth for up to a year. "Turf King" at www.mrochem.com is one such Total Weed Killer.
If the tall weeds are broad leaf weeds use a selective weed killer called "Triple Threat".
Barren weed killer is a Total vegetation herbicide and will kill everything and keep it down for a year.