Written by 3:55 pm Herbicides, Lawn Tips

Crabgrass – How to Kill It

crab grass weed

Crabgrass is one of the most problematic weeds plaguing our yards. From centipede to fescue, regardless of your grass type, crabgrass does not discriminate! Actually, there are over 35 species across North America. Based on your region of the country and grass type, the crabgrass species may vary, but the hatred we have is all the same!

Know Crabgrass's Weakness

Crabgrass species are annuals, which mean they will only grow for one season and then die. Knowing this tidbit will help find the best way to manage this pest. It is important to begin prepping to manage early, for once crabgrass has seeded, it has already begun prepping for next year. For this reason, you’re wasting your money trying to treat crabgrass in late summer after it has seeded. The best option is to focus on preventing it from growing in your yard next year (pre-emergent) or catching it early in the spring (post emergent)

Crabgrass will begin popping up in your yard, flower beds or cracks in your pavement when the soil temperature reaches 55F and remains there for at least 4 days. It will die after seeding and the first frost in the fall\winter. Therefore, you need to apply your pre-emergent weed killer before the seeds begin to germinate. This is the best bet for a crabgrass free lawn. However, pre-emergents will typically only last 12-16 weeks. This means even with a pre-emergent application, you may see some late-summer germination. Lowering the application rate and staggering your pre-emergent treatment can provide longer control.

Use Post-emergent Herbicide on Established Crabgrass

If spring creeps up on you and crabgrass begins to establish, look to use a post-emergent to control quickly before it takes off. Young crabgrass will look like corn sprouting. As it gets larger, it will resemble its namesake. Blades will offshoot from the body and appear to look like crab legs. Also, blades of crabgrass will be easy to identify because they’re bigger than blades of lawn grass.

Larger patches can still be controlled with a post-emergent, but it could be more difficult. This is because a spot-treatment right on the plant might be needed to control the weed. Be careful of overspray with this type of weed killer.

Rake or pull the dead crabgrass out of your turf and fill in with sod, sand or peat moss. Live patches of crabgrass can be pulled up, but make sure you get the complete plant. After that you should prepared just in case some pops back up.

As discussed above, herbicide control is going to be your best route for a weed free lawn. Use what the professionals use and save money. Check out our quick reference guide below for our experts top pick on weed killer for crabgrass. Remember, apply pre-emergent herbicides in Spring before crabgrass begins to grow & apply post-emergent after crabgrass has developed.

Look at the type of turf grass you have, then see our recommendations for the best pre-emergent and post-emergent herbicides.

How do I treat crabgrass if I don't know what type of lawn grass I have?

If you are not completely sure on the type of grass you have, but are sure you don’t want a crabgrass lawn, use Bensumec 4LF for a pre-emergent treatment. For a post-emergent treatment, use Solitare.

Both of these are safe for lawns with multiple types of grasses. Unfortunately, neither of these can be used on St. Augustine lawns and Solitare cannot be applied on fine fescue.

There are several options we feel are the best weed killer for spot-treatment of crabgrass spots in your lawn. Keep in mind these are broad spectrum herbicides so overspray onto other plants will likely damage or kill them. Eraser Max is a professional strength, concentrate formula that will need to be diluted in your sprayer. This product is rainfast for 6 to 8 months and lasts that long before requiring reapplication.

If you don’t want the hassle of having to mix a concentrate and water, go with Roundup Weed and Grass Killer.

Roundup is extremely convenient with the included spray wand. Lastly, Natural Armor Weed and Grass Killer provides an all natural option for homeowners. Repeated applications will likely be needed with this product.

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