When is a good time to use translocated herbicides on certain perennials?

Using translocated herbicides during reproductive growth in perennials is effective because, at this stage, the plants are actively transporting nutrients and energy to their reproductive structures, including developing flowers and seeds. This physiological process also aids in the movement of the herbicide throughout the plant. By applying the herbicide during this period, it can be taken up by the leaves and translocated to the roots and other tissues, which is critical for effectively targeting the entire plant, including the root system.

In contrast, earlier in the growth cycle, such as during vegetative growth, the plant may not be as receptive to uptake and translocation of herbicides, as the focus is more on growth and development rather than reproduction. Applying herbicides before flowering might also not be as effective since the energy and resources are still concentrated in the vegetative parts of the plant rather than in facilitating herbicide movement. After seed production, the plant may enter a senescent stage, reducing its ability or willingness to transport herbicides throughout its system, making this timing less effective for management purposes.