best thing for killing dandelions
If you use either vinegar or Roundup, apply the herbicide directly onto the leaves of the weeds, since these herbicides are non-selective and would harm your grass. By contrast, Weed-B-Gon is selective (it targets broadleaf weeds) and won't harm grass, making it a popular choice for killing dandelions in the lawn.When to Apply Herbicides on Dandelions. Early fall is the best time to kill dandelions with herbicides. Dandelions are broadleaf, herbaceous perennials.Since their leaves die back in winter, it is through their roots that the plants live on.hen to Apply Herbicides on Dandelions. Early fall is the best time to kill dandelions with herbicides. Dandelions are broadleaf, herbaceous perennials. Since their leaves die back in winter, it is through their roots that the plants live on.