What type of weeds are systematic herbicides frequently used to control?

Systemic herbicides are designed to be absorbed by the plant and translocated throughout its systems, making them effective against a wide variety of plant types. This characteristic allows them to target both annual and perennial weeds.

Annual weeds complete their life cycle within one growing season, while perennial weeds can live for multiple seasons, often regrowing each year from their root systems. Since systemic herbicides move through the plant to disrupt vital growth processes, they can effectively kill both types by attacking the roots and stems. They work by impairing the plant's ability to carry out photosynthesis and other essential functions, ensuring that the herbicide's effects reach the entire plant, regardless of whether it is annual or perennial.

The other options are limited in scope, as they specify only one type of weed or seasonal growth patterns, which falls short of encompassing the broad applicability of systemic herbicides.