Try for Free
tab list
PictureThis
English
arrow
English
PictureThis
Search
Search Plants
Try for Free
Global
English
English
This page looks better in the app
picturethis icon
Instantly identify plants with a snap
Snap a photo for instant plant ID, gaining quick insights on disease prevention, treatment, toxicity, care, uses, and symbolism, etc.
Download the App for Free
Continue Reading
Img leaf leftImg leaf right

Top 20 Most Common Weeds in Illinois

Amidst Illinois' varying climatic conditions, from frigid winters to humid summers, and its fertile soil, garden weeds such as Pokeweed, Common milkweed, and Poison ivy thrive vehemently. These pervasive species pose perennial challenges to gardeners and landscapers, entrenching themselves across the diverse Illinoisan landscapes, evading efforts to control their spread and demanding consistent management.

Icon common plants
Most Common Weeds
Pokeweed
1. Pokeweed
Although its berries look juicy and tempting, the fruits and the root of pokeweed are toxic and should not be eaten. Pokeweed is considered a pest species by farmers but is nevertheless often grown as an ornamental plant. Its berries can be made into pokeberry ink as well.
Growth Rate:
Rapid
Common milkweed
2. Common milkweed
Asclepias syriaca, commonly known as common milkweed, is a flowering perennial herbaceous plant native to North America. It contains milky latex which can be toxic to sheep, cows, and other larger mammals (including humans) if it is consumed in large amounts. Many insect species are attracted to common milkweed, most notably monarch butterflies.
Growth Rate:
Rapid
Bittersweet
3. Bittersweet
The species known as bittersweet is a semi-woody vine found in forests, marshes, shrublands, and hedgerows. All parts of the plant contain alkaloids (especially the bright red berries), which are extremely poisonous to humans and livestock if ingested. In spite of its toxicity, bittersweet was hung as a talisman in the past to ward off witchcraft.
Growth Rate:
Moderate
Your Essential Companion for Global Plant Exploration
From American natives to Philippine tropics, discover plants worldwide with our app.
Download the App for Free
Poison ivy
4. Poison ivy
In pop culture, poison ivy is a symbol of an obnoxious weed because, despite its unthreatening looks, it gives a highly unpleasant contact rash to the unfortunate person who touches it. Still, it is commonly eaten by many animals, and the seeds are a favorite with birds. The leaves turn bright red in fall. Its sister species, Western poison ivy (Toxicodendron rydbergii), is not considered to be invasive in the United States, but is noxious in Australia and New Zealand.
Growth Rate:
Rapid
Garlic mustard
5. Garlic mustard
Alliaria petiolata, colloquially known as garlic mustard is a herbaceous biennial plant known for the garlic aroma and smell of its crushed leaves. It can be found in partially shaded and moist places like woodland edges, trails, hedges, and roadsides. Leaves of garlic mustard are used in European cuisine as a spice herb for salads and sauces.
Growth Rate:
Rapid
Virginia springbeauty
6. Virginia springbeauty
Virginia springbeauty (Claytonia virginica) has tiny underground tubers (kind of like potatoes) that taste like chestnuts and are utterly delicious. Early American colonists consumed them, but only when they were desperate because it took a lot of time to collect enough for a meal. Its genus name is in honor of John Clayton, who made essential contributions to the study of plants.
Growth Rate:
Moderate
Velvetleaf
7. Velvetleaf
Abutilon theophrasti is named after the Greek botanist Theophrastus, who was a successor of Aristotle. The velvetleaf is now considered to be an invasive species in many places of the world and is especially dangerous for corn and soybean crops. When left unmanaged, the velvetleaf can create 100s of millions of dollars in damage for farmers.
Common blue violet
8. Common blue violet
The common blue violet is an attractive wildflower known for its blue to purplish white hues. It is common in North America, where it is sometimes associated with a weed. The plant is popular as an ornamental, and it is a state flower in several states in the US. Its flowers and leaves are edible and safe to be planted near pets.
Horseweed
9. Horseweed
Horseweed is a North American herbaceous annual plant with a hairy stem, numerous pointed leaves, and waxy inflorescence. It has been naturalized in Eurasia and Australia, where it is a common weed in urban and agricultural regions. Horseweed can be used in a survival situation to start a friction fire.
White snakeroot
10. White snakeroot
When you're around white snakeroot, it is a good idea to exercise caution. This plant contains a toxin called tremetol which causes a potentially fatal illness. What’s more, if animals who are lactating eat white snakeroot, the tremetol is secreted in the milk and can be passed on to humans in this way. Many early European settlers are suspected to have died of this so-called "milk-sickness" before they understood the plant's hazards.
Lambsquarters
11. Lambsquarters
Lambsquarters has many other names, including pigweed, goosefoot, and bacon weed. This plant seems to appear out of nowhere and is considered by many to be a pesky weed. However, the greens of this plant are edible, can be prepared similar to spinach, and are packed with nutrients.
Growth Rate:
Rapid
Swamp milkweed
12. Swamp milkweed
Swamp milkweed (Asclepias incarnata) is a plant species native to Canada and the continental United States. Swamp milkweed attract butterflies with its nectar. Swamp milkweed gives off a subtle vanilla scent. The stems contain a poisonous milky sap.
Growth Rate:
Moderate
Common purslane
13. Common purslane
Portulaca oleracea, colloquially known as common purslane, is an annual succulent species with reddish stems and tiny yellow, five-petal flowers. It is used for culinary purposes in various parts of the world, most often raw, in salads. Common purslane is also a good companion plant for crops that thrive in moist soils.
Growth Rate:
Rapid
Annual ragweed
14. Annual ragweed
Annual ragweed (Ambrosia artemisiifolia) is one of the most notorious weeds in the world. It is an annual herbaceous plant with highly allergenic pollen and a very vigorous spread. Annual ragweed is a very competitive species, which is why its presence in cultivated plants is highly undesirable.
Growth Rate:
Rapid
Rattlesnake master
15. Rattlesnake master
Rattlesnake master (Eryngium yuccifolium) is a herbaceous perennial plant species that grows best in full sunlight and dry soil. Rattlesnake master is drought tolerant and erosion resistant. The leaves of this coarse plant have been used by Native Americans to create both baskets and sandals. Monarch butterflies love the nectar from this flower, giving them nutrients to complete their yearly migration south.
Common dandelion
16. Common dandelion
*Taraxacum officinale*, widely known as common dandelion, is a herbaceous perennial that can be found in temperate regions all over the world, in habitats with moist soils. The most popular feature of this plant is its fruits, furry spheres that are easily carried by the wind. Although it is generally considered a weed, common dandelion is actually edible and very nutritious.
Growth Rate:
Rapid
Common motherwort
17. Common motherwort
Common motherwort is a wildflower that is attractive but has weed-like tendencies. It is classified as an invasive species in some areas. The flowers are pinkish-purple and hairy and bloom throughout the summer. This plant is commonly found in woodland areas, fields, or disturbed areas.
Common mullein
18. Common mullein
Common mullein (Verbascum thapsus) has been cultivated by farmers and gardeners since colonial times. This herb has a thick stem and leaves covered with a layer of “fur” that feels like flannel. Today, it grows wild in many areas of the U.S., including roadsides and vacant lots. Flowers of common mullein are occasionally brewed into a tea.
Growth Rate:
Rapid
Creeping thistle
19. Creeping thistle
This aggressive weed spreads across grasslands and fields via underground roots that creep horizontally, some for more than 5 m. It can cause major problems to agriculture if its growth is left unchecked. Its seeds feed many birds as well as pest insects. Creeping thistle is generally considered a noxious weed even in its native territory.
Growth Rate:
Rapid
Common bird's-foot trefoil
20. Common bird's-foot trefoil
Common bird's-foot trefoil (Lotus corniculatus) is a common flowering perennial plant that grows widely throughout Europe and North America. Commercially, it is often added to livestock feed to prevent bloating. In Britain, common bird's-foot trefoil is often referred to as "butter and eggs" due to its flowering appearance and golden color. It attracts bumblebees and is considered an invasive species in North America and Australia.
Discover 4 Exciting Reasons to Choose PictureThis
Instantly identify plants with a snap
Identify toxic plants around you
Easily find your perfect green friends
Get full care tips and tricks for your plants
Download the App for Free
Icon code

Scan QR code to download

Icon plant

More Plants in Illinois

Mask group

Most Common Toxic Plants

Illinois' diverse ecosystems, ranging from prairies to forests, create an apt backdrop for the growth of toxic flora. Notable among these is , which poses a risk to both fauna and humans. Additionally, and contribute to the state's array of hazardous vegetation. The prevalence of these plants underscores the need for vigilance in preserving public and ecological health amidst Illinois' rich biodiversity.

Mask group

Most Common Flowers

Illinois, United States, boasts a diverse landscape that nurtures an array of native flowers. The state's climate and soil dynamics are conducive to the proliferation of these blossoms. Among the standout flowers are , , and . These flowers hold great aesthetic allure, cultural resonance, and ecological significance within the state. Sources confirm the accuracy of this information.

Mask group

Most Common Flowers of Spring

As Illinois thaws, a tapestry of blossoms unfurls across its awakening landscapes. The Spring season is heralded by , whose vivid hues metaphorically paint the rebirth of the region. Close on its heels, the delicate petals of dance in the gentle breezes, epitomizing the fragile beauty of the season. Finally, the iconic emerges, symbolizing the essence of Spring's renewal and inspiring in Illinoisans a sense of pride and celebration in nature's cyclical pageant.

Mask group

Most Common Spring Fruits

As the thawing embrace of Spring blankets Illinois, the state burgeons with life, coaxing the dormant fruit plants into a symphony of growth. It's a time when , with its crunchy delight, , a culturally treasured treat, and , celebrated for its crisp sweetness, start their journey to harvest. These principal fruit bearers are intertwined with Illinois's Spring, promising a bountiful season of fresh, home-grown flavors.

Mask group

Most Common Fruits

Illinois' fertile prairies, combined with a temperate climate, create an ideal environment for a variety of fruit plants. Staples such as , , and flourish across the state. These diverse species not only adapt to Illinois' seasons but also embody the rich agricultural heritage, contributing both to local cuisine and the state's ecological tapestry.

Mask group

Most Common Trees

Illinois, United States boasts a diverse climate and soil, providing ideal conditions for native trees to thrive. Among the standouts are , , and . These trees hold significant ecological value, contributing to the state's biodiversity and providing habitats for various species. They also have cultural and symbolic importance, representing Illinois' rich natural heritage. Through their resilience and beauty, these native trees showcase the interconnectedness of the state's ecology and its people.

Mask group

Most Common Tall Trees

Nestled within a temperate climate zone, Illinois fosters a lush landscape ripe for grand arboreal giants. Towering above the rest is , a symbol of strength, followed by the stately , rooted in history. Not to be overshadowed, the soaring stands as a testament to ecological diversity. Each species reflects the splendor and importance of Illinois’ indigenous flora in shaping both skyline and ecosystem.

Mask group

Most Common Flowers of Winter

In the midst of Illinois' frosty Winter, against all odds, certain flowers manage to thrive. Amidst the icy climate, , , and bloom with tenacity and allure. These native Winter-blooming flowers not only withstand the frigid embrace of the season but also symbolize the resilience and beauty of Illinois' natural landscape.

Mask group

Most Common Plants

In Illinois, you can find Pokeweed, Common milkweed, Mulberry, Common buckthorn, Bittersweet, and more! There are 50 types of plants in total. Be sure to look out for these common plants when you’re walking on the streets, in parks, or public gardens.

close
close
Your Ultimate Guide to Plants
Identify grow and nurture the better way!
product icon
17,000 local species +400,000 global species studied
product icon
Nearly 5 years of research
product icon
80+ scholars in botany and gardening
ad
ad
Botanist in your pocket
qrcode
PictureThis Ios DownloadPictureThis Android Download
Scan the QR code with your phone camera to download the app
close
close
Your Ultimate Guide to Plants
Identify grow and nurture the better way!
product icon
17,000 local species +400,000 global species studied
product icon
Nearly 5 years of research
product icon
80+ scholars in botany and gardening
ad
ad
Botanist in your pocket
qrcode
PictureThis Ios DownloadPictureThis Android Download
Scan the QR code with your phone camera to download the app