What is a defining feature of a nonselective herbicide?

A nonselective herbicide is defined by its ability to control all plants indiscriminately, which means it will affect both desired and undesired vegetation in the area where it is applied. This characteristic makes nonselective herbicides particularly useful for applications such as land clearing, managing weeds in non-crop areas, and preparing sites for planting where complete vegetation removal is desired.

In contrast, the other choices highlight features that do not align with the nature of nonselective herbicides. Targets for specific weeds pertain to selective herbicides, which are designed to eliminate particular weeds without harming desirable plants. Safety for all environments is an attribute that is not true for nonselective herbicides, as their broad spectrum of activity can lead to collateral damage in unintended plants, therefore affecting biodiversity. Lastly, while nonselective herbicides will affect annual plants, they do not predominantly target just annuals; they impact all plant types in the application area.