20% Vinegar Weed Killer 1 gallon
One of very few economical organic herbicides. Useful for sidewalk cracks, under greenhouse tables, etc. Four times the strength of regular vinegar, use with caution. Will kill annual weeds and all aboveground foliage of perennials, but most perennials will rapidly regrow after treatment.
May be Green Gobbler or Vinagreen brand depending on supplier availability.