These weeds begin to grow (germinate) in the spring, mature in the summer, and then produce seeds and die by the fall or first hard frost—an entire life cycle completed within 12 months.

When should I kill broadleaf weeds?

The best time to apply a general-purpose broadleaf herbicide is mid-September to early November. The fall is the best time to control perennial broadleaf weeds such as dandelion, plantain, and clover (Figure 1). Going into winter these weeds are storing energy reserves in stems and roots.

Do broadleaf weeds die in the winter?

The truth is that cold weather reduces the activity of weed growth, so weeds do tend to 'die' in winter. There's no time to rest, though. Both summer and winter annual weeds leave their seeds in the soil before they die off, ready for new growth in late summer through the early fall.