How to Kill Crabgrass

“Crabgrass is probably the most common garden weeds that are definitely hard to remove. Sometimes you’ll just give up as if there’s nothing that you can do. Well if your problem is crabgrass, here is a guide that will definitely change your perspective when you encounter crabgrass in your landscape.”


Digitaria sanguinalis - Rasbak/Wikimedia Commons



Do you know what crabgrass looks like? Digitaria is a warm-season annual; it reproduces by seed. People often ask me how to kill it. The short answer is: applying preemergent herbicides at the right time is the best way to get rid of this weed.


Preemergent Herbicides for Killing Crabgrass: When to Apply

To get rid of crabgrass, it helps to know its life cycle. When spring soil temperatures (at a depth of 2″-3″) reach 55-60 degrees Fahrenheit, the first crabgrass seed will germinate (unless you stop them at this time by applying a preemergent herbicide!). From mid-summer to fall, seeds are produced. The plants, themselves (but not the seeds) are killed by frosts in autumn.

Preemergent herbicides (also spelled “pre-emergent”) come in either granular or liquid form and kill crabgrass seedlings as they germinate. Think of preemergent herbicides as forming an invisible shield across the soil surface that stops …


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