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Common milkweed

How to identify Common milkweed (Asclepias syriaca)

Common milkweed, also known as Butterfly flower

Common milkweed is characterized by its capacity to grow in a range of soil conditions, from average, well-draining to dry, in full sun. It is a herbaceous perennial with a milky sap that exudes when stems or leaves are broken. Its seeds are attached to numerous hairs, assisting in wind dispersal, and the distinctive seed pods exhibit a warty texture. Common milkweed easily propagates via seeds or root cuttings, and tends to occupy considerable space, indicating a potential for naturalization in suitable garden settings.

Lifespan

Lifespan: Perennial

Plant Type

Plant Type: Herb

Leaf Type

Leaf Type: Deciduous

Quickly Identify Common milkweed

1

Milky sap exudes from stems and leaves when broken.

2

Distinctive domed umbels of dusty pink or lavender flowers.

3

Fruit is a warty, gray follicle with fine hair and spikes.

4

Oppositely arranged, oblong leaves with milky sap when crushed.

5

Upright stems reaching up to 6 feet with slightly hairy texture.

Common milkweedCommon milkweedCommon milkweedCommon milkweedCommon milkweed

Detailed Traits of Common milkweed

Leaf Features

The leaves of common milkweed are oblong and arranged oppositely, measuring between 3 to 12 inches (8 to 30 cm) in length. They exhibit a thick, light green color, with the underside being downy. The veins are somewhat reddish, and the leaves are rounded at both ends or sometimes abruptly pointed at the tip. When crushed, they exude a distinctive milky sap.

Leaf Arrangement

Opposite

Common milkweed Leaf Arrangement image
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Flower Features

The flowers of common milkweed are distinguished by their domed umbels, each spanning 2 to 3 inches (5 to 8 cm) and consisting of up to 100 blooms. Each flower features five petals, colored in subtle shades of dusty pink or lavender. These blooms are often found in the leaf axils and tend to droop. The bloom season is long-lasting, extending from June through August, making them a distinctive presence during the summer months.

Common milkweed Flower imageCommon milkweed Flower image
Inflorescence Type

Umbel

Common milkweed Inflorescence Type image
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Stem Features

The stem of common milkweed is upright and can grow up to 6 feet (1.8 meters) tall. It is generally unbranched, with only a few branches near the top. The stem is robust and has a slightly hairy texture. When cut or crushed, it exudes a milky latex sap. The color of the stem ranges from light green to grayish-green. The stem often thickens and becomes more rigid as the plant matures, providing structural support.

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Fruit Features

The fruit of common milkweed is a distinctive gray follicle, covered with fine hair and spikes, giving it a warty texture. It is dry and inflated, measuring 2-4 inches (5-10 cm) in length and approximately 1 2/3 inches (4.2 cm) in width. The fruit stands erect, with a swollen base and narrows to a tapered tip. Inside, numerous seeds equipped with hair tufts await wind dispersal. The seed pod's unique appearance makes it a popular choice for dried floral arrangements and is commonly observed from July through September.

Common milkweed Fruit imageCommon milkweed Fruit image
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Common milkweed and Their Similar Plants

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Butterfly weed vs. Common milkweed: What's The Difference?
While Asclepias tuberosa is commonly referred to as butterfly weed, it is also known as Canada root, Indian posy, silky swallow-wort, yellow milkweed, butterfly love, white-root and a variety of other names. Both Native Americans and pioneers would use the butterfly weed to make candle wicks.
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Swamp milkweed vs. Common milkweed: What's The Difference?
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.
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Bloodflower vs. Common milkweed: What's The Difference?
If you are looking to attract butterflies to your garden or yard, the bloodflower is one of the best ways to do it. This plant is known for its ability to attract butterflies with the yellow, red, and orange flowers that bloom on its tall stems in the summer and fall.
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Showy milkweed vs. Common milkweed: What's The Difference?
Though it is poisonous to dogs, cats, and horses, showy milkweed provides an extremely important food source to the monarch and other types of butterflies. It can be very invasive and in most areas is considered a weed. The fluffy "floss" from showy milkweed, however, has similar properties to goose down - it is now being cultivated as a cheaper alternative for jacket and sleeping-bag insulation.
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Green milkweed vs. Common milkweed: What's The Difference?
Green milkweed (Asclepias viridis) is a perennial herb native to the southeast and south-central U.S. The plant sports green flowers, and, like other milkweeds, produces a thick, milky white substance when cut. Milkweeds, green milkweed included, are the typical host plants of monarch butterflies, which lay their eggs on the plant's leaves.
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Narrowleaf milkweed vs. Common milkweed: What's The Difference?
Narrowleaf milkweed (Asclepias fascicularis) is essential for the survival of the Monarch Butterfly, which consumes the nectar of this plant. To return the favor, these butterflies pollinate narrowleaf milkweed, ensuring its continued survival. The seedpods of narrowleaf milkweed (Asclepias fascicularis) look great in dried flower arrangements.
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Whorled Milkweed vs. Common milkweed: What's The Difference?
The whorled Milkweed (Asclepias verticillata) is a perennial herb native to North America which, like other milkweeds, provides food for monarch caterpillars. This form of milkweed is among the most widely distributed varieties and serves as a crucial late-season host for monarch larvae. The Latin name, Asclepias verticillata, is an interpolation of the name of Asclepius, the Greek god of medicine.
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Poke milkweed vs. Common milkweed: What's The Difference?
Poke milkweed is found naturally in many woodlands and grows well in partial shade. Monarchs and rabbits alike enjoy feeding on its foliage. This plant is not invasive, but it is long-lived.
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Key Facts About Common milkweed

Attributes of Common milkweed
Lifespan
Perennial
Plant Type
Herb
Plant Height
90 cm to 1.2 m
Flower Color
Pink
Purple
White
Fruit Color
Silver
Gray
Stem Color
Green
Leaf type
Deciduous
The Toxicity of Common milkweed
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Scientific Classification of Common milkweed

Family
Dogbane
Icon allow
Species
Common milkweed (Asclepias syriaca)
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Distribution Map of Common milkweed

Common milkweed is native to central and eastern United States and Canada. It has been introduced into much of west and central Europe, where it enjoys sandy soils in sunny, disturbed prairies.
Native
Cultivated
Invasive
Potentially invasive
Exotic
No species reported
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