Applying a pre-emergent simply means we are tackling the weeds before they show up in our landscapes and lawns by preventing weed seeds from germinating. So, if you see the weeds in your landscape, the pre-emergent will not kill them. Organic and synthetic, liquid and granular pre-emergents are available and may require 2 applications, depending on the weather. The most common pre-emergent applications are in spring, with the second in fall. The soil temps should be around 45°-52° F, as this is slightly prior to seed germination.
Crabgrass in the lawns is one of the main reasons we apply a pre-emergent in the spring. This and other weeds can be difficult to remove after they have sprouted above ground. Landscape beds will benefit from a pre-emergent as well. Preventing the weeds in your beds means less competition for your beautiful plants and less time weed pulling! Think of the pre-emergent as forming a “blanket” over the ground. If you were to dig in the landscape bed or lawn after the application, you’ll break the barrier and may allow seeds to germinate.
Most of the granular pre-emergent applications should be watered in just after spreading. If you are banking on rain, you’ll need at least 1/2″ of rain and not in the form of a down-pour which could wash away the product.
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