Which type of herbicide would be appropriate to control annual weeds in a lawn?

A pre-emergent herbicide is specifically designed to control annual weeds by preventing their seeds from germinating. This type of herbicide creates a barrier in the soil that stops weed seeds from sprouting, making it particularly effective for managing species such as crabgrass and other annual weeds that germinate in the spring.

Applying pre-emergent herbicides before the weeds' germination period is crucial for their effectiveness. They are crucial in lawn care strategies aimed at maintaining healthy turf by reducing weed competition for nutrients, water, and light early in the growing season.

In contrast, post-emergent herbicides target weeds that have already emerged, systematic herbicides work by translocating through the plant to control perennial weeds, and selective herbicides eliminate specific types of plants while leaving others unharmed – they may not specifically address the issue of preventing annual weeds like pre-emergent herbicides do.