What type of herbicide can be applied to actively growing weeds?

The application of a post-emergence herbicide is specifically designed for actively growing weeds. These herbicides work by targeting and controlling weeds that have already emerged above the soil surface. When applied at this stage, the post-emergence herbicides are absorbed by the plants, leading to their death and allowing for the growth of desired plants or crops in the area.

In contrast, pre-emergence herbicides are used to prevent weed germination and growth by creating a barrier in the soil before the weeds have the chance to sprout. Non-selective herbicides, while they can control a broad range of plants, are not specifically formulated for actively growing weeds and will affect any plant they come into contact with. Selective herbicides are designed to target specific types of weeds while minimizing damage to desired plants, but they may not be effective if the weeds are not actively growing. Thus, the focus on actively growing weeds makes post-emergence herbicides the correct choice in this context.