What is the best approach to control undesirable perennial grasses?

Using a selective herbicide to spot-treat the infested area is considered the best approach to control undesirable perennial grasses. Selective herbicides are designed to target specific plant species while minimizing harm to desirable grasses and plants. This focused application allows for the effective eradication of the unwanted grass without disrupting the overall health of the lawn or garden.

The method is efficient because it directly targets the undesirable grasses, reducing their competition for resources and ensuring that the desired plants can thrive. Furthermore, spot-treating minimizes the amount of herbicide used, which is beneficial for the environment and helps reduce costs associated with broader applications.

Other methods, such as applying granular fertilizers, watering regularly, or using mulch, do not effectively target the undesirable perennial grasses. Fertilizers may promote the growth of the desired grasses but could inadvertently nourish the undesirable ones as well. Regular watering could create more favorable conditions for all plants, potentially exacerbating the issue. Mulching can suppress some types of growth but is not a reliable method for controlling perennial grasses that can penetrate through the mulch. Thus, the targeted application of a selective herbicide is the most effective and practical solution in managing undesirable perennial grasses.