Which type of weeds would not typically be expected to germinate in the spring?

Biennial weeds are characterized by their unique life cycle, which spans two years. In their first year, they typically germinate from seed and grow vegetatively, forming leaves and roots but not producing flowers or seeds. It is in the second year that these weeds complete their life cycle, flowering, producing seeds, and then dying off. Since they do not germinate in the spring, but rather only establish themselves in their first year, it is expected that biennial weeds would not typically be found germinating in the spring season.

In contrast, annual weeds complete their life cycle in one growing season and are often among the first to germinate in the spring. Perennial weeds, on the other hand, can survive multiple years, often regrowing from their root system in the spring. Seasonal weeds is a less commonly used term and does not specifically indicate a particular lifecycle that excludes spring germination. Thus, understanding the life cycle of biennial weeds clarifies why they would not be expected to germinate in the spring.