You will also need to apply a spring pre-emergent herbicide treatment sometime between late January and early May, before temperatures rise and weeds begin to germinate. This helps give you longer coverage and protection from poa annua weed seeds that may germinate later in the season. It will also increase the amount of time the pre-emergent treatment will last. This will help ensure your entire lawn is treated, reducing the number of spots you might miss with one treatment. We strongly recommend that you apply two fall pre-emergent herbicide treatments, spaced approximately 6 to 8 weeks apart from one another. Consult our lawn care calendars to determine when to apply your pre-emergent herbicide treatment. The timing of your application depends on where you live. If you live in an area that does not have frost, you would apply before temperatures drop. Apply your pre-emergents in the fall before the first frost occurs, before the soil temperature reaches 70 degrees or below to make sure it is down before germination begins. Poa annua (annual bluegrass weeds) will begin to germinate in late summer or early fall when soil temperatures drop below 70 degrees. Knowing when poa annua germinates is key to ensuring you apply your pre-emergent herbicide at the right time. Not all pre-emergents can be used on all grass types. Read the label of any pre-emergent you may consider using to be sure it is compatible with the type of lawn you have. In the case of poa annua, that means applying a pre-emergent herbicide like Dimension 2EW, Hi-Yield Weed and Grass Stopper, Barricade 4FL, or another pre-emergent labeled for poa annua control on your lawn before poa annua seeds begin to germinate. They help prevent new weeds from growing in your lawn from seeds. As their name suggests, pre-emergent herbicides are applied before weeds emerge.
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