What term describes a plant growing where it is not wanted?

The term describing a plant growing where it is not wanted is "weed." Weeds are typically defined as unwanted or undesirable plants that can interfere with the growth of cultivated plants or crops, compete for resources such as water, sunlight, and nutrients, or pose other issues in agricultural settings.

Herbicide, on the other hand, refers to a chemical substance used specifically to eliminate or control unwanted vegetation, including weeds. Crop refers to cultivated plants specifically grown for food, fiber, or other economic purposes, and flora is a broad term that encompasses all plant life in a particular region or ecosystem. Therefore, the most accurate term for a plant growing in an undesired location is indeed a weed.