To effectively control perennial plants with herbicides after the seedling stage, you need to use a:

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To effectively control perennial plants after the seedling stage, using a systemic herbicide is crucial. Systemic herbicides are designed to be absorbed by the plant and translocated throughout its system, which allows them to target not only the visible parts of the plant but also the roots and other internal structures. This is especially important for perennial plants as they often have developed root systems that store energy and allow the plant to regrow from the roots even if the above-ground portion is killed.

In contrast, contact herbicides only affect the parts of the plant they come into direct contact with, which is not sufficient for perennials since they can continue to thrive from their root systems. Selective herbicides target specific types of plants or weeds, which may not be effective if the goal is to eliminate all perennial plants indiscriminately. Residual herbicides may prevent new growth by remaining in the soil, but they do not effectively kill existing plants that have already emerged. Therefore, for thorough control of established perennial plants, systemic herbicides are the most effective choice.

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