Prodiamine controls germinating annual grassy weeds, but the same barrier can stop desirable grass seed.
Why I did it this way
I used a granular preemergent containing 0.58% prodiamine with a 0-0-7 analysis. Two 40-pound bags cost 112.61 dollars total; one early-March application was confirmed, while the exact pounds and setting were not preserved.
What I used
- Granular prodiamine
- Broadcast spreader
- Scale
- Broom or blower for hard surfaces
- Irrigation or timely rainfall
What I did
- I worked from the actual turf area. Treat actual grass, not the full lot or bag maximum.
- I chose the label rate around the fall seeding date. Match the desired control period to the future overseeding date and annual active-ingredient limit.
- I treated the spreader setting as calibration, not the rate. Calibration by pounds over a known area is more reliable than copying another spreader setting.
- I applied it uniformly. Use straight overlapping lanes, close the gate while turning, and protect beds and hard surfaces.
- I swept granules off pavement. Return them to turf instead of washing them into storm drains.
- I watered it in according to the label. The barrier must reach the soil surface.
- I recorded the application timing. The seeding decision depends on date and rate, not memory.
What I learned
- Assuming the bag coverage is the amount your lawn needs
- Applying a second dose without checking the annual limit
- Forgetting that grass seed is also a germinating grass
- Washing granules into drains
My result
The single early-March application became the prevention step in the 2026 plan. I did not add a second application that could have interfered with September overseeding.
Know your limits
Follow the pesticide label exactly. Do not use the article to substitute for current label rates, local restrictions, or protective-equipment requirements.