The Best Weed Killers for Dandelions

Dandelions are easily recognized by their bright yellow color.

There are about 40 species of dandelion, also known as lion's tooth and puffball. While dandelions are commonly used for tea, medicine, salads, beer and wine, they tend to give homeowners headaches as an invasive weed. The best way to kill dandelions depends on your particular situation.

Behavior

Dandelions are perennials that prefer moist areas with lots of sunshine. Dandelions are particularly difficult to remove for several reasons. First, dandelions grow a strong taproot that is capable of extending 10 to 15 feet into the ground. Second, dandelion crowns, located at the top of the root, can regenerate a new plant even if the plant has been cut at or just below the surface. Finally, once established, dandelion seeds can become wind-borne for several miles, resulting in new infestations.

Problems

Dandelions compete with desirable grasses, plants and crops for water, light, soil nutrients, space and carbon dioxide. In addition, dandelions form dense mats that may distract from the aesthetics of a well-maintained yard. Dandelions attract bees and gophers, clog up tractor radiators and cause poor footing on athletic fields.

Removal

Removing dandelions with your hands or a specialized dandelion removal tool, such as a dandelion knife, is most effective if done vigilantly and before the dandelion produces seed. Specialized dandelion tools are designed to remove the entire root system while causing minimal harm to the surrounding area. Alternatively, dandelion seedlings can be killed by spraying a post-emergent selective herbicide, including 2,4-D, triclopyr, MCPA or mecoprop. The herbicide isoxaben can be sprayed on soil to kill dandelions before they emerge, and the herbicide glyphosate can be sprayed to kill established dandelions but will also kill turfgrass.

Prevention

The best way to prevent dandelion infestations is to maintain the health of your grasses, plants and crops. This will ensure that dandelions lose the competition for water, light, soil nutrients, space and carbon dioxide. Mulching with landscape fabrics, such as polypropylene, polyester or black polyethylene fabric, may be effective in preventing dandelions from growing. Planting groundcover, such as ivy, can be equally effective.

References

• Pennsylvania State University; Weeds and Herbicides; Dwight D. Lingenfelter, Nathan L. Hartwig; 2007
• UC IPM Online; Dandelions; D.W. Cudney, C.L. Elmore; 2009