A broadleaf herbicide will only kill broadleaf weeds, such as dandelions. A broadleaf herbicide is good for killing dandelions in lawns, as the herbicide will kill the dandelions and not the grass. The other kind of effective dandelion herbicide is a non-selective herbicide.
Well, dandelions enjoy the best of both worlds. Above-ground, their seeds ride the wind currents, poised to drop into the slightest opening in your lawn to propagate the species. Meanwhile, below-ground, they strike down a taproot up to 10 inches long.
A thick lawn is the best method for preventing dandelions and other broadleaf weeds in the lawn. Mow your lawn at a high setting on your mower, and follow a regular feeding program to achieve a lawn that is thick enough to keep weeds like dandelions from establishing in the first place.
Description of Dandelions
How to Kill Dandelions. You can kill dandelions and prevent them from taking over your lawn using either natural organic or chemical controls. Chemical controls are efficient and effective. On the other hand, natural weed control is labor intensive but will always be more eco-friendly.