How to Remove Onion Grass In Your Yard (6 Methods)

Onion grass

Onion grass is a common problem. We’ll show you how to remove this weed from your yard with simple methods like regular mowing and using the right products.

Dealing with this pesky weed can be easier than you think. Whether you use natural methods (like vinegar) or synthetic sprays, sticking to a plan will help you manage onion grass effectively.

What Is Onion Grass?

Onion grass, often mistaken for regular grass, is actually quite different. It’s a type of wild onion, recognized as the grass that smells like onion, which grows in clumps and can quickly spread across lawns and gardens. You can recognize it by its tall, thin, green stalks and distinct onion smell it releases when crushed.

This plant, which can grow about 18 inches tall, is not just tough on the eyes but tough to get rid of due to its deep, bulbous roots. Each clump can survive through a wide range of temperatures, which makes onion grass a year-round challenge. Understanding its resilience and growth pattern is the first step to controlling it effectively in your outdoor space. 

6 Ways to Get Rid of Onion Grass

Getting rid of onion grass involves a few tried and true methods. Here’s a few control options on how to kill onion grass:

1. Manual Removal

Pulling weeds by hand
Photo Credit: Omega / Adobe Stock Free / License

Start by pulling onion grass out by hand. This is the most effective when the soil is moist, such as after a rain or in the early morning. Make sure to get as much of the root as possible to prevent it from growing back. 

2. Mowing

man pushing a lawn mower
Photo Credit: Pixabay

Regular mowing won’t kill onion grass, but it will prevent the plants from flowering and seeding, which stops them from spreading further. Keep your lawn mowed to a short height consistently. But remember, never cut more than one-third of your grass blades.

For the recommended mowing height for your grass type, check out our guide: “Lawn Mowing Tips: How to Mow a Lawn the Right Way.”

3. Herbicides

Spraying weed killer with a spray bottle
Photo Credit: dean / Adobe Stock Free / License

If manual removal and mowing aren’t cutting it, you might need chemical help. Use a selective post-emergent herbicide that targets grassy weeds like onion grass. Be sure to follow the application instructions carefully to avoid harming other plants. 

4. Vinegar Solution

For a natural approach, you can spray a mixture of vinegar and water directly on the onion grass. The acetic acid in the vinegar will kill the leaves and can help prevent regrowth, especially with repeated treatments. 

5. Glyphosate Application

In severe cases, glyphosate can be a powerful treatment against onion grass. It’s a non-selective herbicide, so apply it carefully to the onion grass to avoid damaging nearby plants.

Learn more about glyphosate in our article: “Glyphosate: Pros, Cons, and Alternatives.”

6. Corn Gluten Meal

corn gluten meal fertilizer
Photo Credit: Phu Thinh Co / Flickr / CC BY-SA 2.0

This organic fertilizer is excellent for controlling onion grass before it sprouts. Apply corn gluten meal to your lawn in early spring to prevent onion grass seeds from germinating.

FAQ About Onion Grass

Can you eat wild onion grass?

Yes, onion grass is edible. The plant is closely related to chives, garlic, and leeks.  

What is the best time of year to treat onion grass?

The best time to tackle onion grass is in the early spring before it starts to flower and spread seeds. You can also treat it in the fall when it’s actively growing, making it more susceptible to herbicides and easier to pull out by the roots.

How does onion grass affect other plants?

Onion grass can compete with other plants for nutrients, water, and sunlight, which can hinder the growth of your garden plants and grass. Its aggressive nature makes it important to control to keep a healthy garden.

Is onion grass harmful to pets?

Onion grass is part of the allium family, which is known to be toxic to cats and dogs if ingested in large quantities. It’s best to keep pets away from this plant to avoid any health issues.

Seek Expert Help with Onion Grass

Dealing with onion grass doesn’t have to be a tough battle. Lawn care professionals use smart, proven methods to stop this weed from ruining your lawn. Plus, following our preventive tips above can keep your outdoor space looking great year-round!

Need help with controlling onion grass? A lawn care pro can mow your lawn, apply the right treatments, and give you peace of mind. Reach out to a local expert today and take the first step towards a lush, weed-free lawn.

Main Photo Credit: Famartin / Wikimedia Commons / CC BY-SA 4.0

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Rela Catucod

Rela Catucod, a writer and gardening enthusiast, blends her expertise in nurturing plants with helpful tips in her articles. With experience in caring for orchids and succulents, she knows the secrets to keeping plants healthy. She aims to assist garden lovers in cultivating thriving, beautiful gardens in their homes.