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What do pre-emergents do and how do they work?
There are two types of pre-emergent products available in today's market place that the homeowner should know about. One type stops the germination of crabgrass and foxtail, as well as, other select annual weeds such as spurge. The second type stops the germination of broadleaf weeds such as dandelions. Both products put down a protective barrier to stop the germination of their target weeds. However, the difference is in the timing of these two different applications.
The first treatment that you are scheduled to receive in March contains a balanced fertilizer to help green up and maintain your lawn. However, also in the Spring (April), you will receive as part of your service the type of pre-emergent that stops grassy annual weeds such as crabgrass. It is important to have this protective barrier put down before the soil temperature reaches 55 degrees on a consistent basis. Crabgrass will not potentially germinate until the soil temperature reaches 55 degrees or higher on a consistent basis.
On the other hand, dandelions germinate in the Fall and flower (seed) in the Spring. As a part of the pre-emergent treatment, you will also receive an application of broadleaf weed killer that will eliminate any dandelions that germinated in your lawn last Fall. Air temperature, however, should be 60 degrees or higher to successfully kill most broadleaf weeds. So, you will be receiving your broadleaf weed control treatment this year (2nd...