![]() Weedmaster, Brash, Rifle-D, etc.), and aminopyralid (i.e. Herbicide products containing 2,4-D, dicamba+2,4-D (eg. The best time for control using herbicides is generally when plants are in the younger rosette stages of growth in late February and early March. Mature plants can grow up to 6 to 9 feet tall (Figure 2). Later flower stalks elongate during the spring producing clusters of white flowers in June. After resuming active growth in late winter, they form larger rosettes. Younger plants can be identified by their fern-like leaves with leaf petioles that have purple spotting and no hairs. These young rosettes are often found in areas where poison hemlock was present the previous year, particularly along fence rows and other isolated areas. Poison hemlock plants form rosettes that remain green throughout the winter in a somewhat semi-dormant stage (Figure 1). ![]() Classified as a biennial, it often grows as a winter annual in Kentucky, particularly plants that germinate during the previous fall. Poison hemlock is easily recognized throughout the winter and early spring. ![]() Winter annual and biennial weeds typically germinate from seed in the fall and produce flowers during the spring. This is when cool-season weeds are younger and begin their active vegetative growth before initiating flowers later in the spring. Further, the preferred time to implement control tactics can often be in March as daytime air temperatures begin to rise and are maintained above 55F. ![]() Late winter is one of the best times of the year to assess fields and fencerows for presence of cool-season weeds. ![]()
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