Common Lawn Weeds in Arizona

Weeds You’ll Likely Find in Your Arizona Lawn

There’s nothing quite like a green, lush lawn and the feel of bare feet on soft grass. But a great lawn doesn’t come overnight — it takes work. Part of keeping a great lawn is ensuring that it’s free of weeds. All it takes is one small weed to spawn others, and if you don’t act quickly, it won’t be long before they overtake your lawn. Lawn weeds are common anywhere, including in Arizona, where you may have either desert landscaping or grass. In this post, we’ll take a closer look at the types of lawn weeds to look out for in the Grand Canyon state and how to manage them properly.

Barnyard Grass

Characterized by flowering stalks and a greenish-purple color, this weed can grow up to several feet tall if left to flourish. It reproduces by spreading its seeds, and a single barnyard grass can produce as many as 40,000 of them. In order to avoid a yard full of barnyard grass, be sure to nip this weed in the bud early in the summer when it begins to grow to ensure it doesn’t spread out of control.

Perennial Bluegrass

Fitting to the name, this weed is characterized by a blue-green color and a bushy stem. It has a wide growing range, which typically begins in March and concludes in September of every year. In addition to perennial bluegrass, Arizona is also home to an annual bluegrass that tends to flourish during the cooler fall months. It’s best to treat these types of bluegrass throughout the spring, summer, and fall months. 

Wild Oat

Unlike the aforementioned weeds that we’ve discussed so far, wild oat tends to like to grow during the winter months in Arizona. If left unattended, these weeds can grow up to 9 inches in height. They’re characterized by flowing bristles at the top and rough blades throughout. Wild oat weeds may also exhibit reddish hairs at the base. Because these weeds require little water to flourish, they can grow just about anywhere. 


One of Arizona’s biggest (and most dangerous) weeds, Johnsongrass can grow up to 7 feet tall. While it may not pose a huge threat to lawns and yards, it can be devastating to agriculture. Johnsongrass is anchored by large stems that can extend up to 3 feet underground and its grains can lie dormant for several years before sprouting, meaning it can be very difficult to fully eradicate such weeds. What’s more is that these weeds can release poison if their growth path is interrupted, which makes it even more important to stay on top of weed control.

A big part of controlling lawn and yard weeds in Arizona isn’t just managing them via pre-emergent weed treatments, but also properly identifying any that do begin to grow so a specific treatment plan can be created to eradicate them. When it comes to weed treatment, you don’t want to be guessing at the types of weeds you’re treating. That may only make the problem worse. Let Green Keeper Weed Control take the guesswork out of weed control! Call us today at 480-895-5561 to schedule weed control services for your yard.