Which characteristic is NOT typically associated with grassy weeds?

Grassy weeds are typically characterized by narrow leaves, parallel veins, and a straight growth habit. These features align with the biological classification of grasses, which belong to the family Poaceae. Narrow leaves allow grasses to efficiently utilize light and manage water loss, while parallel veins are a distinguishing feature of monocots, which include grasses. Furthermore, their straight growth habit contributes to their competitive abilities in various environments.

In contrast, broad leaves are more commonly associated with broadleaf plants rather than grassy weeds. Broadleaf plants, which belong to various other plant families, exhibit wider leaf structures that facilitate different patterns of photosynthesis and water usage. Therefore, broad leaves do not align with the typical characteristics of grassy weeds, making them the correct answer for the characteristic not typically associated with this group.