True or False: Devrinol 50-DF ornamental is effective against both germinating and established weeds.

Devrinol 50-DF is a pre-emergent herbicide, which means it primarily targets weed seeds during the germination process. Its effectiveness lies in its ability to create a barrier that prevents the seeds from sprouting. Therefore, it is designed specifically for germinating weeds and does not impact those that are already established. Established weeds have already sprouted and developed root systems, making them resistant to the actions of pre-emergent herbicides like Devrinol. Consequently, stating that it is effective against both germinating and established weeds is inaccurate, leading to the conclusion that the assertion is false.