Which of the following is a common perennial broadleaf weed in Iowa's ornamental settings?

Common Mullein is indeed a perennial broadleaf weed frequently found in ornamental settings across Iowa. This weed is notable for its tall flowering spikes and fuzzy, velvety leaves, which can make it easily identifiable. Its ability to thrive in a variety of soil conditions and its tolerance to drought contribute to its persistence in gardens and landscaped areas.

In contrast, Yellow Foxtail, another option listed, is an annual grassy weed rather than a broadleaf, commonly found in disturbed areas and agricultural fields, but not specifically recognized as a broadleaf weed in ornamental settings. The Eastern Gray Squirrel and Prairie Vole are animals and not plants at all, making them irrelevant to the context of identifying weeds. Thus, Common Mullein fits the criteria for a perennial broadleaf weed in ornamental environments in Iowa.