Colorado’s altitude and dry air favor field bindweed and mallow as persistent lawn invaders. Understanding the common Types Of Lawn Weeds In Colorado helps you take control before they take over your yard. This guide covers the most frequent weeds you will encounter in the Centennial State, from broadleaf perennials to grassy annuals.
Weeds thrive in Colorado’s unique climate—hot summers, cold winters, and low rainfall. Many are drought-tolerant and spread quickly through seeds or underground roots. Identifying them early makes removal much easier.
Below, you will find a detailed breakdown of each weed type, with practical steps to manage them. No fluff, just straight facts for your lawn care routine.
Broadleaf Perennial Weeds In Colorado Lawns
These weeds come back year after year from deep root systems. They are tough and require persistent effort to remove.
Field Bindweed
Field bindweed is a vine with white or pink trumpet-shaped flowers. It wraps around grass and other plants, choking them out. Its roots can go several feet deep, making it hard to pull by hand.
- Appearance: Small arrow-shaped leaves, trailing stems.
- Season: Active from spring to fall.
- Control: Repeated digging or spot herbicide application in late summer.
Canada Thistle
This weed has spiny leaves and purple flower heads. It spreads aggressively through rhizomes—underground stems. Canada thistle is a noxious weed in Colorado, meaning you must control it by law.
- Mow regularly to prevent flowering.
- Apply a systemic herbicide in early fall.
- Monitor for regrowth next season.
Dandelion
Everyone knows dandelions with their bright yellow flowers and puffball seeds. They have a deep taproot that breaks easily when pulled. Left alone, they spread quickly across your lawn.
- Control: Pull when soil is moist, or use a spot herbicide with 2,4-D.
- Tip: Remove before seeds form to stop spreading.
Mallow
Mallow, also called cheeseweed, has round leaves and small white flowers. It grows low to the ground and thrives in compacted soil. Mallow is common in Colorado due to dry conditions.
Hand pulling works best for small infestations. For larger areas, improve soil aeration and water deeply.
Plantain
Broadleaf plantain has wide, oval leaves with prominent veins. It grows in a rosette pattern and tolerates heavy foot traffic. Narrowleaf plantain looks similar but with longer, thinner leaves.
Both types respond well to manual removal if you get the entire root. Use a weeding tool for best results.
Grassy Weeds Common In Colorado
Grassy weeds look like grass but grow faster and ruin lawn uniformity. They are often annuals, meaning they die each year but leave seeds behind.
Crabgrass
Crabgrass is a low-growing annual grass with wide blades. It appears in summer when soil temperatures warm up. It spreads by seed and can quickly take over thin areas.
- Prevention: Apply pre-emergent herbicide in early spring.
- Control: Pull young plants or use post-emergent herbicide.
Foxtail
Foxtail has bushy seed heads that resemble a fox’s tail. It is dangerous for pets because the seeds can get stuck in fur or skin. Foxtail thrives in dry, disturbed soil.
- Mow before seed heads form.
- Hand pull isolated plants.
- Use a pre-emergent in late winter.
Quackgrass
Quackgrass is a perennial grass with long, pointed leaves and a shallow root system. It spreads through rhizomes and can survive cold winters. It often appears in patches.
Removal requires digging out the entire root network. Herbicides like glyphosate work but may kill surrounding grass.
Annual Bluegrass
Annual bluegrass is a light green grass with a distinctive seed head. It grows in cool, damp areas and dies in summer heat. It leaves bare spots when it dies.
- Control: Improve drainage and reduce watering.
- Prevention: Use a pre-emergent in early fall.
Weeds That Thrive In Colorado’s Dry Climate
Colorado’s low humidity and intense sun favor weeds adapted to drought. These weeds often have deep roots or waxy leaves to conserve water.
Purslane
Purslane has fleshy, succulent leaves and small yellow flowers. It grows flat on the ground and stores water in its leaves. It is edible but invasive in lawns.
Hand pull when soil is dry to avoid breaking stems. Mulch garden beds to prevent regrowth.
Kochia
Kochia, also called burning bush, is a bushy weed that turns red in fall. It grows quickly and can reach several feet tall. It is a noxious weed in Colorado.
- Control: Mow before seed production.
- Herbicide: Use a broadleaf killer in spring.
Russian Thistle
Russian thistle is the classic tumbleweed. It breaks off at the stem and rolls across the landscape, spreading seeds. It grows in dry, sandy soil.
Prevent by keeping soil covered with grass or mulch. Hand pull young plants before they become woody.
Seasonal Weed Management For Colorado Lawns
Managing weeds requires timing. Different weeds emerge at different times of year. Here is a simple seasonal guide.
Spring
Apply pre-emergent herbicides in late March or early April. This stops crabgrass and foxtail seeds from germinating. Also, hand pull dandelions and mallow while they are small.
Summer
Spot treat broadleaf weeds with a post-emergent herbicide. Water deeply to encourage grass growth, which crowds out weeds. Mow at the correct height—3 inches for most Colorado grasses.
Fall
This is the best time to control perennial weeds like bindweed and thistle. Apply systemic herbicide when plants are moving nutrients to their roots. Aerate your lawn to reduce compaction.
Winter
Weeds are dormant, but you can plan ahead. Test your soil pH and add amendments if needed. Order pre-emergent for early spring application.
Natural And Chemical Control Methods
You have options when it comes to weed control. Choose based on your preference and the severity of the infestation.
Manual Removal
Hand pulling works for small areas. Use a weeding tool to get the entire root. Do this after rain when soil is soft. For taproot weeds like dandelion, a long tool is best.
Mulching
Mulch garden beds to block sunlight and prevent weed seeds from sprouting. Use organic mulch like wood chips or straw. Apply 2–3 inches deep.
Herbicides
Selective herbicides kill weeds without harming grass. Look for products with 2,4-D, dicamba, or MCPP. Non-selective herbicides like glyphosate kill everything, so use carefully.
- Pre-emergent: Apply before seeds germinate.
- Post-emergent: Apply after weeds appear.
Cultural Practices
Healthy grass outcompetes weeds. Fertilize in spring and fall with a balanced fertilizer. Water deeply but infrequently to encourage deep roots. Mow at the right height and sharpen blades regularly.
Identifying Weeds By Leaf Shape And Flower
Knowing how to identify weeds helps you choose the right control method. Here are key features to look for.
Leaf Shape
Broadleaf weeds have wide, flat leaves with visible veins. Examples include dandelion, plantain, and mallow. Grassy weeds have narrow, parallel-veined leaves like crabgrass and foxtail.
Flower Color
Yellow flowers are common in dandelion and purslane. White flowers appear on bindweed and clover. Purple flowers are typical of thistle and some violets.
Growth Habit
Some weeds grow upright like thistle, while others spread low like purslane. Vining weeds like bindweed climb on other plants. Rosette-forming weeds like dandelion grow in a circle.
Common Mistakes In Weed Control
Many homeowners make errors that make weeds worse. Avoid these common pitfalls.
- Pulling too late: Remove weeds before they seed.
- Using wrong herbicide: Match the product to the weed type.
- Overwatering: Weeds love moist soil as much as grass.
- Mowing too short: Short grass allows sunlight to reach weed seeds.
- Ignoring soil health: Compacted soil favors weeds over grass.
How To Prevent Weeds From Returning
Prevention is easier than removal. Follow these steps to keep your lawn weed-free.
- Maintain thick grass through proper fertilization and watering.
- Overseed thin areas in fall to fill gaps.
- Apply pre-emergent at the right time each year.
- Remove weeds immediately when you see them.
- Improve soil drainage and aeration annually.
Frequently Asked Questions About Colorado Lawn Weeds
What Is The Most Common Weed In Colorado Lawns?
Field bindweed and dandelion are among the most common. Both adapt well to Colorado’s dry climate and spread easily.
How Do I Get Rid Of Bindweed In Colorado?
Bindweed requires persistent effort. Dig out as much root as possible, then apply a systemic herbicide in late summer. Repeat yearly until it stops returning.
Can I Use Vinegar To Kill Lawn Weeds In Colorado?
Household vinegar is not strong enough for most weeds. Horticultural vinegar with 20% acetic acid can work on young weeds, but it may also damage grass. Use with caution.
When Should I Apply Pre-emergent In Colorado?
Apply pre-emergent in early spring when soil temperatures reach 50–55°F. This is usually late March to early April. A second application in late summer helps control fall weeds.
Are There Weeds That Are Good For Colorado Lawns?
Some clover species fix nitrogen and stay green with little water. However, most homeowners prefer a uniform grass lawn. If you want a low-maintenance lawn, consider clover as a ground cover.
Final Tips For Managing Types Of Lawn Weeds In Colorado
Staying consistent is the key to weed control. Check your lawn weekly for new growth. Act fast when you spot a weed—early removal saves time later. Combine manual, chemical, and cultural methods for best results.
Colorado’s climate makes some weeds inevitable, but you can keep them under control. Focus on building healthy soil and thick grass. With patience and the right approach, your lawn can look great all season.
Remember that different weeds require different strategies. Know your enemy before you attack. Use the guide above to identify and manage each weed type effectively.
Your lawn is a living system. Treat it well, and it will reward you with less weeds and more green space. Start today by identifying the weeds in your yard and picking the right control method.