Poa Annua Problems
Suppressing this Grassy Weed
Nothing spoils the sight of a healthy, green lawn like unwanted weeds. One of the most aggressive culprits out there is poa annua (annual bluegrass). This lawn invader is the most common and widely distributed grassy weed in the world, and will take over your lawn if given the opportunity.
This cool-season annual weed tends to thrive in milder weather when lawns are more susceptible to weeds and disease. Its boat-shaped, flower-like seed heads and pale green color make it clearly distinguishable from desirable turfgrass species. Although annual bluegrass can be an issue on all lawns, it is primarily found in areas where Bermuda grass, fescue, and bentgrass are grown.
Poa annua leaves behind unsightly bare patches when it dies in the heat of the summer, causing lawns to take on a dry, unhealthy appearance. Additionally, like the majority of weeds, poa greatly weakens healthy turf by monopolizing the valuable nutrients that desirable grasses need for survival. In fact, poa will compete aggressively with existing turf. This makes it difficult for your lawn to thrive and is especially harmful for maturing grasses that have not yet had the opportunity to become fully established. Poa will ultimately crowd out new grasses and leave bare patches in its wake.
When it comes to poa annua, prevention is critical. Homeowners often take action when they notice the white, flowery seed heads adorning their lawns. Once poa reaches this stage, however, it is often too late for safe post-emergent treatment. If you have had poa issues in the past, you can be sure that they will return once again – whether annually, biannually, or sporadically. If given ample notice, your local Weed Man can apply a pre-emergent to target poa annua and other undesirable growth.
When it comes to your cultural practices, raising the height of your mower can help defeat this low-growing weed. Deep, infrequent watering will also limit opportunities for the damp-loving poa to thrive.
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