Herbicide spraying on dandelions (Taraxacum sp.). Dandelions are widely known as a very invasive and persistent species. They are quick to flower and produce masses of windborne seeds. Their long taproots make them very difficult to eliminate from lawns and gardens, However, they are also edible and are known to have medicinal properties. Herbicides can be used to control dandelions but they may also damage other plants. Many herbicides are poisonous and they should be used minimally and in a highly targeted manner.