Higher rates are needed to control larger plants. Results with Canada thistle and perennial sow-thistle are more consistent than with dandelions. Dandelions, however, have better regrowth during the cooler fall conditions. Creeping grasses like quackgrass, bromegrass and creeping red fescue can spread to form patches if left unchecked. Quackgrass spreads very quickly, while bromegrass and fescue spread more slowly.
Fescue can be much more persistent than bromegrass or quackgrass.
These weeds usually invade from grassed areas along field boundaries but can also establish from seed. Bromegrass and fescue are more tolerant of glyphosate than quackgrass and, if left unchecked, can become expensive weed problems. Fescue is only suppressed by glyphosate and may require repeated high application rates for control. Anthem and Sundance suppress quackgrass in wheat. Creeping broad-leaved weeds like field bindweed, toadflax and leafy spurge spread mainly by roots and are usually confined to patches in the field.