Control of broadleaf weeds is most often accomplished with a three-way combination of the herbicides 2,4-D, 2,4-DP, MCPA, MCPP, triclopyr, clopyralid, and dicamba. 2,4-D, MCPA, and triclopyr are generally more effective on dandelions, while 2,4-DP, MCPP, and clopyralid are more effective on clovers. Dicamba is better for difficult broadleaves such as thistles. Usually a three-way herbicide will have 1 or 2 compounds from each grouping (e.g. 2,4-D, MCPP, and dicamba). Ester formulations are generally more effective at this time of year. However, as temperatures warm (above 60-70 degrees) volatility of esters results in a drift hazard and so amine formulations become more appropriate choices. New this year from PBI Gordon are broadleaf herbicide combinations with a herbicide called carfentrazone, which is reported to result in faster burndown of the targeted weeds. There are also options for preemergent control of broadleaf weeds (check the labels for Gallery Â¥, Dimension Â¥, pendimethalin, Barricade Â¥, and Ronstar Â¥). Remember, though, that preemergent herbicides are for control of annual broadleaf weeds (such as pigweed, spurge, oxalis, and knotweed) and will not result in good control of perennials.