Source: University of Minnesota

An early corn and soybean harvest and good weather conditions are keeping the window of opportunity open for fall dandelion control this year. Fall is an excellent time to target several herbaceous perennials including: alfalfa, Canada thistle and dandelion. 

A fall application is more effective than a spring application because systemic herbicides such as glyphosate, 2,4-D, Express, Basis and Synchrony tend to accumulate in greater amounts in a perennial plant's roots or rhizomes after a fall application. Movement to the below ground roots and rhizome buds increases herbicide effectiveness and possibly decreases winter hardiness of the plant.

More information