Photo: Howard F. Schwartz, Colorado State University, Bugwood.org, dandelion, Taraxacum officinale
Mulch can be used as a non-chemical management option. Herbicide options for landscapes or nurseries include the pre-emergenents: dichlobenil (Casoran); flumioxazin (BroadStar - nursery/SureGuard); indaziflam (Marengo/Specticle); oxyfluorfen + oryzalin (Rout); oxyfluorfen + pendimethalin (OH2); oxyfluorfen + prodiamine (Biathlon). Post-emergenent herbicides for landscapes or nurseries include: clopyralid (Lontrel); diquat dibromide (Reward); glufosinate-ammonium (Finale); glyphosate (Roundup and others); and paraquat (Gramoxone, restricted-use).
For dandelions in turfgrass, any of the post-emergent herbicides containing 2, 4-D, florasulam (Defendor); metsuluron; or triclopyr + clopyralid (Confront) are effective. Treatments made in last summer or early fall provide the best control of perennial broadleaf weeds.
Remember to always read the label for proper application sites and rates.