Residential Site Planning Landscape
Arizona’s Sonoran Desert is a delicate ecosystem, and when invasive species take root, they wreak havoc on native plants, wildlife, and even our homes. Stinknet (Oncosiphon piluliferum), also known as globe chamomile, is one such invader that took Arizona by storm last spring and summer—and it’s back for more.
If you noticed bright yellow puffball flowers blanketing the roadsides, open lots, and even creeping into your yard, that was stinknet in full bloom. While it may look harmless (or even a little cheerful), this plant is a serious problem—it spreads aggressively, increases wildfire risk, and even poses health hazards.
Let’s break down everything homeowners need to know about stinknet, including how to identify it, why it’s dangerous, and what you can do to stop it.
(Want a broader look at invasive species in Scottsdale? Check out our full guide on Scottsdale’s Most Problematic Invasive Plants for more information.)
Stinknet is an invasive winter annual that originates from South Africa. It was first documented in Arizona in the early 2000s, and since then, it has spread rapidly across Maricopa, Pinal, and Pima counties, taking over roadsides, disturbed soils, and even well-maintained landscapes.
The name “stinknet” comes from its strong, pungent odor, which is often compared to turpentine or industrial solvents. If you crush the leaves, the smell becomes even stronger—and trust us, it’s not pleasant.
When stinknet dries out in late spring, it turns into a brittle, highly flammable mass of plant debris. Because it grows in dense clusters, it creates the perfect fuel for wildfires, helping flames spread more quickly across the landscape.
If you live in a fire-prone area, having stinknet on your property significantly increases the risk of fire damage.
Stinknet spreads aggressively, forming dense mats that choke out native wildflowers, grasses, and shrubs. It disrupts the natural balance of desert ecosystems and makes it harder for native pollinators and wildlife to thrive.
If left unchecked, stinknet can completely alter the plant diversity in an area—and once it takes hold, it’s hard to get rid of.
For allergy sufferers, stinknet is bad news. Its pollen has been known to cause severe allergic reactions, sneezing, itchy eyes, and even asthma-like symptoms.
Even worse? Burning stinknet releases caustic smoke that can irritate the lungs and cause respiratory distress—especially for children, the elderly, and people with asthma.
Not sure if you have stinknet on your property? Here’s what to look for:
If you see stinknet on your property, act fast—this plant spreads by seed, and each plant can release thousands of seeds per season.
(Tip: Wear gloves! The oils from stinknet can cause skin irritation in some people.)
If stinknet has taken over a large area, you may need to use herbicides to control it.
Important: Always follow label instructions, and avoid spraying on windy days to prevent drift onto native plants.
Since stinknet spreads so quickly, individual efforts are important—but community action is even better.
For more detailed management plans and updates, check out the Arizona Landscape Contractors Association’s Stinknet Invasive Species Alert.
Stinknet is more than just a weed—it’s an invasive species that damages ecosystems, increases fire risk, and affects human health.
The best defense is early detection and removal. If you see stinknet popping up in your yard, take action before it spreads.
Got a stubborn stinknet problem? If you need professional guidance on landscape management and invasive plant removal, reach out today—let’s keep Arizona’s landscapes healthy and stinknet-free!
