How to get rid of Poa Annua in cool season lawns
By My Yard Editorial Team · 7/28/2026
The Quick Answer
Poa annua is an annual — the real control is a fall pre-emergent applied when soil hits 70°F and dropping (typically late August). Post-emergent options exist but are expensive and slow.
The Witty Breakdown
It shows up as lighter green, faster-growing clumps that seed at any mowing height and then die ugly in June.
Every plant drops hundreds of seeds before you notice it. This is a multi-year seed-bank problem.
Step-by-Step Fix
- 1
Apply pre-emergent (prodiamine or dithiopyr) in late summer, then again in spring.
- 2
Do not overseed the same fall you pre-emerge.
- 3
Raise mowing height to 3.5–4 inches to shade out seedlings.
- 4
Reduce irrigation frequency — poa loves constantly damp surfaces.
Pro-Tip / Do Not Do This
Don't try to spot-spray it out in spring. You'll create dead patches that fill with more poa seed by fall.
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