Is it true that selective herbicides will not affect desirable grasses?

Selective herbicides are specifically formulated to target certain types of plants, particularly weeds, while minimizing impact on desirable plants, such as grasses. However, this does not mean they are entirely harmless to all desirable grasses. There are conditions under which selective herbicides can still affect these desirable plants depending on various factors such as the type of herbicide used, the concentration, and the specific grass species in question.

In general, selective herbicides are designed to control particular types of weeds like broadleaf plants, while leaving grasses largely unaffected. Nonetheless, certain grasses may still exhibit sensitivity to these herbicides, especially if the herbicide concentration is higher than recommended, or if the grasses are stressed due to factors like drought or poor soil conditions at the time of application.

Overall, while selective herbicides aim to avoid harming desirable grasses, the potential for impact exists, meaning that the assertion that they will not affect desirable grasses is inaccurate. Thus, the answer is that it is not true that selective herbicides will never affect desirable grasses.