Which Is It Annual Bluegrass Or Poa Annua?

What Is Poa?

poa annua grass weed

Poa annua pronounced Po-Ah Ann-UAhh is a winter annual that comes up in the late summer and early fall depending on how far north you are. The best way to identify poa annua is look for the prolific white seed heads, waxy stems and bunching habit it forms. Also the green grass in an otherwise brown lawn is a good indicator as well. This is the main target weed of the winter lawn care season. This weed goes by many names when being described (poa, poanna, poa annua, bluegrass, annual bluegrass, poa grass, winter grass, poana grass) and many more *#%$ *&$# words that usually come out of peoples mouths when they see that it has risen from the dead to attack their lawn after it has been sprayed multiple times.

 

This is one of those weeds that even if you care nothing about your lawn you hate this weed. Your not alone, lawn treatment companies, landscapers, golf courses, sports fields, commercial properties and residential homes alike feel the scourge of this troublesome weed. If you’ve ever tried to kill this weed you know how hard it can be to get it licked. We often get calls from frustrated home owners and landscapers who have tried to take on this weed by themselves to no avail. More times than not we take over and clean up what others have not been able to tackle. If you are tired of trying to get rid of this weed fill out the form below to get a quote on our lawn care program that will do the dirty work for you.

 

How To Get Rid of Poa?

Poa is one of those things that even if you follow the instructions precisely to the T you can still have breakthrough. Controlling bluegrass has to be a multi pronged approach where it is being attached from multiple angles with multiple modes of action to be successful.

Step 1: Decrease Compaction and Excess Moisture

This winter annual weed loves compacted ground and excess moisture and Nitrogen in the soil. While there is not much you can do about the excess Nitrogen you can help relieve compaction through core aeration and topdressing during your grasses active growing season. For warm season grasses like bermuda, zoysia and centipede this is in Spring- Mid Summer. For cool season grasses such as fescue and annual rye this will be primarily in the Fall.

Step 2: Get a Pre-Emergent Applied In Time

Annual bluegrass is a winter annual weed that germinates once soil temperatures drop below a certain point in the fall. In order to have the best chance at stopping a large portion of poa annua from germinating this pre emergent needs to be correctly applied before the weed germinates. These do no good if they are applied after the weed has sprouted.

Step 3: Take Care Of Breakthrough Early

If you do see poa germinate it is best have it killed when it is young. You will have a much better chance of maintaining control if the weed does not have an established root system from growing all fall and winter long.

Different Types Of Control With Different Grass Types 

 

Poa Annua Control in bermuda Grass

This is one of the more manageable turf grasses to control poa in. Bermuda is very susceptible to blue grass infestations but this turf grass has the widest range of options that can be used to control it once it pops up.

Poa Annua Control in Zoysia Grass

With zoysia being a warm season grass that goes semi dormant during the winter this is the second most manageable turf to control poa in. Zoysia has less options than bermuda due to it not fully going to sleep during the winter. Applying products such as round up to zoysia during this time period will result in horrible winter kill in the spring green up phase.

Annual Bluegrass Control In Fescue

This is a hard grass to keep poa annua out of. Often times this grass is being reseeded at the same time that the poa is germinating. Usually what happens is a home owner will get both bluegrass and fescue germination simulationalsy. This is a result of the watering and fertilization process that goes into fescue overseeding. Once the fescue has established there are very few effective options to get rid of the poa effectively. There are some commercial products that can be used on areas besides residential homes but apply these products to home owner yards is a violation of the law.

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