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Annual Bluegrass (Poa annua): This Is NOT A Festival!

Annual Bluegrass (Poa annua)

This Is NOT A Festival!

Annual Bluegrass (Poa annua) is commonly referred to at Marcum’s Nursery as “po anna”. Due to its scientific name, Poa annua, tells us this grassy weed is not only an annual, but also known as an annual nuisance to Oklahomans! This weed is every landscaper’s and gardener’s nightmare if not addressed quickly. Annual Bluegrass (Poa annua), is one of the most common and major weed problems for not only residential and commercial lawns in Oklahoma, but also in highly maintained turfgrasses used for sporting events world-wide.

Removing it is very challenging!

“It’s a rapid and prolific seeder. Each small plant can produce about 100 seeds in as few as eight weeks. Viable seed can be produced just a few days after pollination, allowing the plant to reseed even in frequently mowed lawns.” (UC

To maintain a healthy lawn in Oklahoma, it’s important to pre-emerge beginning mid-August through mid-September to help control the seeds from germinating. Our high temps help keep it from seeding, but as soon as we experience our cooler temps, the seeds will germinate again. Work diligently to remove solitary plants before seed production starts. Over seeding in the fall season with desirable grass types may help stop or at least choke out slow emerging weed seedlings.

While completely ridding your lawn of Poa annua may seem next to impossible, our tree and lawn experts at Marcum’s Nursery recommend Image.

Image is a ready-to-spray herbicide consumer concentrate product that not only kills Annual Bluegrass (Poa annua), but also helps eliminate common chickweed, henbit, *dandelion, dollarweed, wild onions and wild garlic. NOTE: Do NOT apply on Fescue grass.

For Best Results: Apply Image and allow the Image application to dry. After the application has dried, water it in to ensure the Image application is getting to the root. Don't wait any longer than a week to water in your application.

Wait 48-hours before mowing your yard. You will see results in 2-3 weeks and should be completely dead within 3-5 weeks.

*For difficult weeds, you may have to apply another Image application, but you will know in 6 weeks if you need to do another treatment.


24 FL. OZ. container covers 6,000 sq. ft.
32 FL. OZ. container covers 8,000 sq. ft.

For more information on Image and Annual Bluegrass (Poa annua), contact Marcum’s Nursery.