But it's also the active ingredient in Preen's Crabgrass Control product. Dithiopyr works by inhibiting the growth of root cells, making it impossible for germinated seeds to grow. It also works ...

Flexible application allows for both spring and fall use providing season long crabgrass control. Available in a 5 pound bottle. FEATURES & BENEFITS: Excellent tank mix partner with fertilizers ...

An example of a pre-emerge product is Prowl H2O. This herbicide is used to control Crabgrass in Bermudagrass hayfields. Post-emerge products are used to kill weeds after they have germinated.

A further problem with crabgrass is its seeds. “The seeds remain viable in the soil for many years, making it a persistent and challenging weed to control,” she adds. Garden Weasel WeedPopper ...

In Delaware, crabgrass usually germinates between March 15 and April 15. Depending on the product, time of application, location and rainfall in the spring, reapplication may be necessary within 60 ...