At this time of year, crabgrass rears its ugly head across countless lawns. That’s why so many of us are frantically Googling how to get rid of crabgrass at the moment. Crabgrass essential looks like an unkempt blotch of grass, with blades which sprawl out in different directions to resemble a crab. It’s an annual weed which can be rather problematic to remove from lawns and patios alike, much like dandelions.
These plants will not only survive, but flourish in hot and dry climates, which makes them a nuisance despite the heatwaves. Add to that, crabgrass is bad news for your lawn — it will sap and limit the nutrients your grass receives, resulting in stunted growth. Plus, if left unchecked, crabgrass will spread its seed before it finally dies in the fall, so you could end up with the same problem next year. Don’t worry though — here we will take you through how to get rid of crabgrass step-by step, while keeping your precious lawn unscathed.
If your lawn has seen better days, be sure to also check out how to revive dead grass, 7 signs that you are cutting your grass too short that could be damaging your lawn's health and read about the best time to water your lawn according to the experts.
1. Manually pull the weeds
• Weeding tool
• Gardening gloves
• Post-emergent herbicide
• Pre-emergent herbicide
If you’re just dealing with a few sporadic clumps of crabgrass, you can remove these by hand using a dedicated tool, such as Grampa's Weeder ($39.99, Amazon (opens in new tab)). This will remove each weed with a single motion. While this method works fine for small, immature sections of crabgrass, which you should pull up as soon as you spot, you should take care if your crabgrass is well-established.
If you attempt to remove a large clump of crabgrass with a manual tool, you could pull up a chunk of your lawn with it as well, thanks to the deep root system. On top of that, if your crabgrass has visible seeds it’s about to disperse, you could be doing more harm than good as the seeds will likely fall and germinate in the hole you’ve just made.
If your crabgrass is likely to do some damage on removal, use a chemical treatment instead as mentioned in step two. If the seeds are already exposed, then there’s not much point in removing the weed as you will only make the problem worse. In this instance, you’re better off letting it die naturally in the fall and then treating the ground in the spring, as described in step three.
Make sure you seal away any weeds you do pull up in a trash bag — the seeds can still spread and grow even from here.
2. Chemical treatment
This is another popular method for dealing with crabgrass as well as other weeds, and it’s ideal for widespread growth. Post-emergent herbicides are typically applied by spray directly to the crabgrass itself rather than across the lawn as a whole.
There’s a huge range of treatments available in most home department stores, but when you’re picking one out, make sure it will be safe to use on your grass. You can do this by checking the label and ingredients list. We recommend Scotts TouchUp Weed Control for your Lawn ($22.49, Amazon (opens in new tab)).
This method is ideal if you don’t want to damage your lawn as you uproot crabgrass. However, don’t bother applying it if the weed has already seeded. By the time the herbicide takes effect, the seeds will have already been scattered and the treatment will be wasted.
3. Apply a pre-emergent herbicide
If you want to prevent such an extensive problem next year, you could apply a pre-emergent herbicide in the spring using a spreader. Also known as crabgrass preventer, this will stop any seeds from germinating when the time comes, ultimately preventing the growth of crabgrass. Bear in mind, you shouldn’t bother trying to grow grass seeds if you’re using a pre-emergent herbicide — most types will prevent these seeds from germinating too. Stick to the summer or fall for overseeding in this case.
There’s a range of pre-emergent herbicides available from most home department stores, such as The Andersons Barricade Professional-Grade Granular Pre-Emergent Weed Control ($73.88, Amazon (opens in new tab)). Be aware though, the key to its success is applying it at the right time and being persistent if reapplication is necessary.
You should apply a pre-emergence herbicide in the springtime when the soil is above 50 degrees Fahrenheit and the flowers are in full bloom. For guidance, you could apply it when it’s time for your lawn to be mowed for the second time in the spring. Bear in mind that severe crabgrass growth may require more than one application. Check the herbicide’s label to confirm its lifespan if you think this may be the case. Remember, you don’t need to apply it across the entire lawn — just in crabgrass hotspots.
If you want to use a natural alternative, corn meal gluten is another option. This will slow the growth of crabgrass as well as other weeds. However, it’s not as powerful versus a chemical application and it can be an expensive method.
You can top up your application by buying fertilizer which contains pre-emergent herbicide as well. That way you can continue applying it while promoting your lawn’s health and growth. These aren’t as widely available, but they can still be found — such as The Andersons Dimension Pre-Emergent Weed Control with Fertilizer ($74.88, Amazon (opens in new tab)).
4. Keep your lawn healthy
Finally, if you want to keep crabgrass at bay, it’s imperative that you keep your lawn as healthy as possible. First, make sure your grass is watered and fertilized regularly, so it has access to sufficient nutrients. This promotes a thick and strong turf, which is less likely to let crabgrass invade. It’s a good idea to aerate your lawn as well for the same reason.
Make sure you’re mowing at the optimum height too. Use the taller setting on your lawn mower and aim to leave your grass at three inches in height. This way, the grass blades create more shade over the soil which deters the growth of crabgrass seeds. Any clippings can be left behind as a natural fertilizer as well as added shade.
Remember to cover up any bare spots on your lawn with fresh grass seeds, otherwise you’re just leaving space for more crabgrass to claim.
You can also read our guide on how to get rid of lawn grubs for a pest-free backyard.
For more lawn tips, tricks, and how-tos, check out our guides on how to plant grass seed, how to make your grass greener, how to stripe your lawn, how to lay sod, how often should you fertilize your lawn and when to do it, 7 common lawn care mistakes you're probably making right now and 7 ways to revive dead grass.
While you work in the garden, you might want to check out our guide on the best gardening gloves that we have tried and tested.