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ragweed
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ragweed (Ambrosia)
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Key Facts About ragweed

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Distribution of ragweed

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Distribution Map of ragweed

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Exploring the ragweed Plants

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8 most common species:
Ambrosia artemisiifolia
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.
Ambrosia trifida
Giant ragweed
Giant ragweed, a native plant to North America, is an allergy sufferer's nightmare. It causes dramatic allergic reactions in more than 23 million Americans annually. In spite of this, the wildflower is edible, and evidence suggests that Native Americans actually planted it as a crop and harvested the seeds for their oil. Giant ragweed can be invasive, however, and out-competes many native species. Modern horticulture practices recommend against planting it.
Ambrosia psilostachya
Cuman ragweed
Cuman ragweed (Ambrosia psilostachya) is a flowering perennial plant that grows along roadsides and fields. Cuman ragweed grows best in dry soil. Many people have allergic reactions to this plant and its blooms.
Ambrosia acanthicarpa
Flatspine bur ragweed
Flatspine bur ragweed (Ambrosia acanthicarpa) is a member of the sunflower family. This and other ragweed causes massive amounts of hay fever in the late summer and early fall. Each plant is a pollen producer par excellence and can churn out over a billion grains of pollen each year. In fact, so much pollen is produced that the flowers turn from green to yellow.
Ambrosia chamissonis
Silver burr ragweed
Silver burr ragweed (Ambrosia chamissonis) is a perennial herbaceous plant that is commonly found growing along beaches and other sandy, coastal locations. A sprawling plant that will grow to 3 m long. It has both male and female flowers on the same plant. Flowers develop into fruit, which is covered in sharp spines.
Ambrosia deltoidea
Triangle bursage
Triangle bursage (Ambrosia deltoidea) is a shrub species that grows from a taproot and contains a complex root system. Triangle bursage produces many thin branches that grow to be 50 cm tall. Triangle bursage leaves become hairless with age and the plant produces fruit.
Ambrosia dumosa
White bursage
White bursage (Ambrosia dumosa) is a ragweed shrub species that is native to California. White bursage grows throughout western North America and is related to the sunflower. This species is also called bur sage, burro weed, and burro bush.
Ambrosia ambrosioides
Canyon ragweed
Canyon ragweed is a member of the sunflower family, although it looks nothing like a traditional sunflower. This plant blooms in early spring and is followed by a fruit that resembles a prickly burr.

All Species of ragweed

Annual ragweed
Ambrosia artemisiifolia
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.
Giant ragweed
Ambrosia trifida
Giant ragweed
Giant ragweed, a native plant to North America, is an allergy sufferer's nightmare. It causes dramatic allergic reactions in more than 23 million Americans annually. In spite of this, the wildflower is edible, and evidence suggests that Native Americans actually planted it as a crop and harvested the seeds for their oil. Giant ragweed can be invasive, however, and out-competes many native species. Modern horticulture practices recommend against planting it.
Cuman ragweed
Ambrosia psilostachya
Cuman ragweed
Cuman ragweed (Ambrosia psilostachya) is a flowering perennial plant that grows along roadsides and fields. Cuman ragweed grows best in dry soil. Many people have allergic reactions to this plant and its blooms.
Flatspine bur ragweed
Ambrosia acanthicarpa
Flatspine bur ragweed
Flatspine bur ragweed (Ambrosia acanthicarpa) is a member of the sunflower family. This and other ragweed causes massive amounts of hay fever in the late summer and early fall. Each plant is a pollen producer par excellence and can churn out over a billion grains of pollen each year. In fact, so much pollen is produced that the flowers turn from green to yellow.
Silver burr ragweed
Ambrosia chamissonis
Silver burr ragweed
Silver burr ragweed (Ambrosia chamissonis) is a perennial herbaceous plant that is commonly found growing along beaches and other sandy, coastal locations. A sprawling plant that will grow to 3 m long. It has both male and female flowers on the same plant. Flowers develop into fruit, which is covered in sharp spines.
Triangle bursage
Ambrosia deltoidea
Triangle bursage
Triangle bursage (Ambrosia deltoidea) is a shrub species that grows from a taproot and contains a complex root system. Triangle bursage produces many thin branches that grow to be 50 cm tall. Triangle bursage leaves become hairless with age and the plant produces fruit.
White bursage
Ambrosia dumosa
White bursage
White bursage (Ambrosia dumosa) is a ragweed shrub species that is native to California. White bursage grows throughout western North America and is related to the sunflower. This species is also called bur sage, burro weed, and burro bush.
Canyon ragweed
Ambrosia ambrosioides
Canyon ragweed
Canyon ragweed is a member of the sunflower family, although it looks nothing like a traditional sunflower. This plant blooms in early spring and is followed by a fruit that resembles a prickly burr.
Weakleaf bur ragweed
Ambrosia confertiflora
Weakleaf bur ragweed
The pollen of all ragweeds, including weakleaf bur ragweed, is a notorious allergen for humans, causing various allergic reactions. Although native to North America and Mexico, this plant has been naturalized in Australia and Israel. It is listed as a noxious weed in these countries. It prefers poor and dry soils, and grows abundantly along roads, highways, and city streets.
Common burrobrush
Ambrosia salsola
Common burrobrush
Common burrobrush is a scraggly bush found in the deserts of the United States and Mexico. It is known for emitting an offensive cheese-like odor when crushed. Common burrobrush produces small cup-like flowers.
Skeletonleaf bur ragweed
Ambrosia tomentosa
Skeletonleaf bur ragweed
Other names for skeletonleaf bur ragweed (Ambrosia tomentosa) include silverleaf povertyweed and skeleton-leaf bursage. It’s an indigenous species to North America, but in some states it’s considered a noxious weed, which means it can cause ecological devastation.
Lanceleaf ragweed
Ambrosia bidentata
Lanceleaf ragweed
Ambrosia bidentata is an annual herb up to 1 m tall. Leaves have only a few lobes compared to the complexly divided leaves of some related species, sometimes no lobes at all. Flower heads are small and inconspicuous, as the plant is wind-pollinated. The heads develop into spiny burs as the seeds ripen.
Woolly fruit bur ragweed
Ambrosia eriocentra
Woolly fruit bur ragweed
Ambrosia eriocentra is a rounded shrub reaching over 1.5 metres in height. The stems are brownish gray in color, with young twigs coated in light woolly fibers and older branches bare. Leaves are lance-shaped and up to 9 cm long, not counting the winged petioles. The leaves have rolled lobed or toothed edges.
Cheeseweed burrobrush
Ambrosia monogyra
Cheeseweed burrobrush
Ambrosia monogyra is a shrub up to 4 m tall. Leaves are very thin and thread-like, sometimes divided into thread-like lobes. The staminate flowers have translucent white corollas and the pistillate flowers are rounded, fruit-bearing structures. The fruit is an achene with a single whorl of several papery wings.
Slimleaf bur ragweed
Ambrosia tenuifolia
Slimleaf bur ragweed
Slimleaf bur ragweed is a slender perennial herb distinguished by its delicate, finely divided leaves and inconspicuous greenish flower heads. Thriving in disturbed, open habitats, its deep root system allows it to withstand drought conditions. Its wispy appearance belies a resilient nature, often making it a robust presence in its native ecosystem.
Western ragweed
Ambrosia psilostachya var. coronopifolia
Western ragweed
Western ragweed is a captivating plant, known for its unique ability to deter insects, possibly due to its slightly bitter smell. It's often incorporated in naturalistic gardens for this benefit. Interestingly, its tolerance for drought conditions made it a critically vital forage species for livestock, particularly in arid regions. Despite its utility, caution is urged, for it can cause allergies in sensitive individuals.
Coastal ragweed
Ambrosia hispida
Coastal ragweed
Coastal ragweed is an adaptive coastal plant, characterized by its rough, bristly texture. Its gray-green foliage and spiky clusters of inconspicuous flowers adapt well to sandy dunes and saline conditions. Significantly, coastal ragweed's sprawling habit provides stabilization to fragile ecosystems, showcasing an embodiment of resilience amidst harsh seaside environments.
Rio grande ragweed
Ambrosia cheiranthifolia
Rio grande ragweed
Rio grande ragweed is a flowering perennial with distinctively divided, feather-like leaves, adapted to thrive in arid environments. Its inconspicuous greenish-yellow flowers are arranged in tight clusters. This species is hardy and draught-tolerant, often found in sandy soils where it forms scrubby, compact bushes, embodying resilience through its robust root system.
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More Popular Genus

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Dracaena
Dracaena
Dracaena are popular house plants that are easy to grow. They can tolerate low-light conditions and require little watering. Their leaves range from variegated to dark green. Their characteristic traits include woody stems that grow slowly but offer a striking appearance for small spaces such as apartments or offices.
Ficus
Fig trees
Fig trees have been cultivated in many regions for their fruits, particularly the common fig, F. carica. Most of the species have edible fruits, although the common fig is the only one of commercial value. Fig trees are also important food sources for wildlife in the tropics, including monkeys, bats, and insects.
Rubus
Brambles
Brambles are members of the rose family, and there are hundreds of different types to be found throughout the European countryside. They have been culturally significant for centuries; Christian folklore stories hold that when the devil was thrown from heaven, he landed on a bramble bush. Their vigorous growth habit can tangle into native plants and take over.
Acer
Maples
The popular tree family known as maples change the color of their leaves in the fall. Many cultural traditions encourage people to watch the colors change, such as momijigari in Japan. Maples popular options for bonsai art. Alternately, their sap is used to create maple syrup.
Prunus
Prunus
Prunus is a genus of flowering fruit trees that includes almonds, cherries, plums, peaches, nectarines, and apricots. These are often known as "stone fruits" because their pits are large seeds or "stones." When prunus trees are damaged, they exhibit "gummosis," a condition in which the tree's gum (similar to sap) is secreted to the bark to help heal external wounds.
Solanum
Nightshades
Nightshades is a large and diverse genus of plants, with more than 1500 different types worldwide. This genus incorporates both important staple food crops like tomato, potato, and eggplant, but also dangerous poisonous plants from the nightshade family. The name was coined by Pliny the Elder almost two thousand years ago.
Rosa
Roses
Most species of roses are shrubs or climbing plants that have showy flowers and sharp thorns. They are commonly cultivated for cut flowers or as ornamental plants in gardens due to their attractive appearance, pleasant fragrance, and cultural significance in many countries. The rose hips (fruits) can also be used in jams and teas.
Quercus
Oaks
Oaks are among the world's longest-lived trees, sometimes growing for over 1,000 years! The oldest known oak tree is in the southern United States and is over 1,500 years old. Oaks produce an exceedingly popular type of wood which is used to make different products, from furniture and flooring to wine barrels and even cosmetic creams.
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Key Facts About ragweed

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Attributes of ragweed

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Scientific Classification of ragweed

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Distribution of ragweed

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Distribution Map of ragweed

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Native
Cultivated
Invasive
Potentially invasive
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care detail

How to Grow and Care for ragweed

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More Info About Caring for ragweed
species

Exploring the ragweed Plants

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8 most common species:
Ambrosia artemisiifolia
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.
Ambrosia trifida
Giant ragweed
Giant ragweed, a native plant to North America, is an allergy sufferer's nightmare. It causes dramatic allergic reactions in more than 23 million Americans annually. In spite of this, the wildflower is edible, and evidence suggests that Native Americans actually planted it as a crop and harvested the seeds for their oil. Giant ragweed can be invasive, however, and out-competes many native species. Modern horticulture practices recommend against planting it.
Ambrosia psilostachya
Cuman ragweed
Cuman ragweed (Ambrosia psilostachya) is a flowering perennial plant that grows along roadsides and fields. Cuman ragweed grows best in dry soil. Many people have allergic reactions to this plant and its blooms.
Ambrosia acanthicarpa
Flatspine bur ragweed
Flatspine bur ragweed (Ambrosia acanthicarpa) is a member of the sunflower family. This and other ragweed causes massive amounts of hay fever in the late summer and early fall. Each plant is a pollen producer par excellence and can churn out over a billion grains of pollen each year. In fact, so much pollen is produced that the flowers turn from green to yellow.
Show More Species

All Species of ragweed

popular genus

More Popular Genus

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Dracaena
Dracaena
Dracaena are popular house plants that are easy to grow. They can tolerate low-light conditions and require little watering. Their leaves range from variegated to dark green. Their characteristic traits include woody stems that grow slowly but offer a striking appearance for small spaces such as apartments or offices.
Ficus
Fig trees
Fig trees have been cultivated in many regions for their fruits, particularly the common fig, F. carica. Most of the species have edible fruits, although the common fig is the only one of commercial value. Fig trees are also important food sources for wildlife in the tropics, including monkeys, bats, and insects.
Rubus
Brambles
Brambles are members of the rose family, and there are hundreds of different types to be found throughout the European countryside. They have been culturally significant for centuries; Christian folklore stories hold that when the devil was thrown from heaven, he landed on a bramble bush. Their vigorous growth habit can tangle into native plants and take over.
Acer
Maples
The popular tree family known as maples change the color of their leaves in the fall. Many cultural traditions encourage people to watch the colors change, such as momijigari in Japan. Maples popular options for bonsai art. Alternately, their sap is used to create maple syrup.
Prunus
Prunus
Prunus is a genus of flowering fruit trees that includes almonds, cherries, plums, peaches, nectarines, and apricots. These are often known as "stone fruits" because their pits are large seeds or "stones." When prunus trees are damaged, they exhibit "gummosis," a condition in which the tree's gum (similar to sap) is secreted to the bark to help heal external wounds.
Solanum
Nightshades
Nightshades is a large and diverse genus of plants, with more than 1500 different types worldwide. This genus incorporates both important staple food crops like tomato, potato, and eggplant, but also dangerous poisonous plants from the nightshade family. The name was coined by Pliny the Elder almost two thousand years ago.
Rosa
Roses
Most species of roses are shrubs or climbing plants that have showy flowers and sharp thorns. They are commonly cultivated for cut flowers or as ornamental plants in gardens due to their attractive appearance, pleasant fragrance, and cultural significance in many countries. The rose hips (fruits) can also be used in jams and teas.
Quercus
Oaks
Oaks are among the world's longest-lived trees, sometimes growing for over 1,000 years! The oldest known oak tree is in the southern United States and is over 1,500 years old. Oaks produce an exceedingly popular type of wood which is used to make different products, from furniture and flooring to wine barrels and even cosmetic creams.
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