I used Prodiamine on March 1, using 5 month rate, so that protection would last until the first part of August (first time using Prodiamine, other years I have used Dimension). I need to overseed (tttf) to take care of summer drought/fungal damage. I still have no weeds. I am concerned about whether Prodiamine may still be active. Yesterday I seeded a small test area to see if I get germination. It has been hot and dry in August and September (still 90+ this week) so maybe that's why I have no weeds. Or might there be no weeds because Prodiamine March to August killed all the weed seeds? I can hold off on seeding until the end of September. I don't want to waste my seeds and water if it will fail because of Prodiamine. For those of you who have used Prodiamine, what do you think? Should I be concerned because I don't have weeds when protection should have ended weeks ago? At what point does Prodiamine stop germination? If I get sprouts from my test area, am I good to go?