• Photo of Asclepias syriaca (Asclepias syriacas)

Plant Profile: Asclepias syriaca

Taxonomy: Asclepias syriaca

Names

Common Milkweed

  • Photo of Asclepias syriaca (Asclepias syriacas)

Phonetic Spelling:as-KLEE-pee-as seer-ee-AY-kah

Genus:Asclepias

Species:syriaca

Family:Apocynaceae

Common milkweed is a tall, native perennial herb characterized by its milky sap. To prevent skin irritation, it's advisable to wear gloves while handling this plant. It thrives in well-drained soils under full sunlight but can also adapt to poorer or drier conditions. This plant readily propagates by seed and can easily establish itself in gardens, often occupying a significant amount of space. Additionally, it can spread through its rhizomes.

**Preferred Locations:** Fields, roadsides, and other disturbed areas with dry soil.

**Distribution:** Commonly found in weedy environments, it is native or has naturalized in places like roadsides and fields.

**Recommended Uses:** Ideal for naturalized areas, meadows, butterfly gardens, or native flower gardens as a herbaceous perennial. However, caution is advised when planting in borders due to its rapid spread.

**Pests, Diseases, and Other Issues:** While it generally faces no serious problems, it can become weedy. Aphids that feed on milkweed are frequently seen but can typically be ignored. This plant does not thrive in shaded areas.

Asclepias syriaca Feature Summary

Asclepias syriaca Image Gallery

Tags

#showy flowers
#poisonous
#fragrant flowers
#drought tolerant
#wildlife plant
#pink flowers
#weedy
#nectar plant
#low maintenance
#erosion control
#dried flowers
#deer resistant
#native garden
#Monarch butterfly
#naturalizes
#wildflower garden
#larval host plant
#food source fall
#food source herbage
#food source nectar
#food source pollen
#coastal UPL
#dry soils tolerant
#butterfly friendly
#nectar plant early summer
#nectar plant mid-summer
#nectar plant late summer
#FACU Piedmont Mountains
#problem for cats
#pollinator garden
#problem for dogs
#problem for horses
#audubon
#meadows

Similar Plants

Asclepias syriaca Feature Summary

Attributes
Native Americans used the plant as a fiber source. During WWII the seeds were collected and the hairy coma or "floss" on the seeds was used in making life jackets. The coma is used today for pillows and blankets.
Central & E. Canada to Central & E. U.S.A., NC
Flowers provide a nectar source for butterflies, bees and other pollinators and the plant is the larval host plant of the monarch butterfly and milkweed tussock moth, which appear in the spring and summer and may have one to three broods in the north and four to six broods in the south. This butterfly breeds all year long in Florida, south Texas, and southeastern California. Adult Monarch butterflies feed on nectar from all species of milkweeds. . Also fed upon by the milkweed weevil and milkweed longhorn beetle.
Perennial
Fragrance
Wildlife Food Source
Attractive Flowers
Easy to Grow
Wildlife Larval Host
Fruit
Fruit a hairy and spiked gray follicle dry and inflated, 2"-4" long 1 2/3" wide erect, with a thick end and tapered tip. It has many hair-tufted seeds that are wind dispersed. Seed pod has a warty appearance and is used in dried flower arrangments. Displays from July through September
Gray/Silver
> 3 inches
1-3 inches
Flowers
2- to 3-in., domed umbel of dusty pink or lavender 5 petaled flowers with up to 100 flowers per cluster and 1-3 clusters per stem. They grow in the leaf axis; often drooping. The bloom season is long-lasting from June through August.
Pink
Purple/Lavender
White
Green
Fragrant
Showy
Long Bloom Season
4-5 petals/rays
1-3 inches
Leaves
3- to 12-inch, thick light green opposite, oblong leaves; downy underside; reddish veins, rounded at both ends or abruptly pointed at the tip. Milky sap when crushed.
Elliptical
Ovate
Oblong
Lanceolate
> 6 inches
Leathery
Stem
Have a milky liquid when crushed.
Poisonous to Humans
TOXIC ONLY IF LARGE QUANTITIES EATEN. Vomiting, stupor, weakness, spasms.
Cardiac glycosides and resinoids
Seeds
Leaves
Stems
Flowers
Bark
Fruits
Roots
Whole Plant Traits
Herbaceous Perennial
Native Plant
Poisonous
Wildflower
Cultural Conditions
Full sun (6 or more hours of direct sunlight a day)
Good Drainage
Occasionally Dry
3 feet-6 feet
12 inches-3 feet
Coastal
Mountains
Piedmont
4a
4b
5b
5a
6a
6b
7a
7b
8b
8a
3a
3b
9a
9b
Clay
Loam (Silt)
Sand
Shallow Rocky
Landscape
Butterfly Garden
Pollinator Garden
Native Garden
Drought
Deer
Dry Soil
Erosion
Poor Soil
Naturalized Area
Butterflies
Pollinators
Songbirds
Bees
Specialized Bees
Poisonous to Humans
Problem for Cats
Problem for Dogs
Problem for Horses
Weedy

Asclepias syriaca Attributes

Asclepias syriaca: Uses (Ethnobotany)

Native Americans used the plant as a fiber source. During WWII the seeds were collected and the hairy coma or "floss" on the seeds was used in making life jackets. The coma is used today for pillows and blankets.

Asclepias syriaca: Country Or Region Of Origin

Central & E. Canada to Central & E. U.S.A., NC

Asclepias syriaca: Wildlife Value

Flowers provide a nectar source for butterflies, bees and other pollinators and the plant is the larval host plant of the monarch butterfly and milkweed tussock moth, which appear in the spring and summer and may have one to three broods in the north and four to six broods in the south. This butterfly breeds all year long in Florida, south Texas, and southeastern California. Adult Monarch butterflies feed on nectar from all species of milkweeds. . Also fed upon by the milkweed weevil and milkweed longhorn beetle.

Asclepias syriaca: Life Cycle

Annual
Biennial
Bulb
Perennial
Woody

Asclepias syriaca: Recommended Propagation Strategy

Division
Grafting
Layering
Leaf Cutting
Root Cutting
Seed
Stem Cutting

Asclepias syriaca: Play Value

Attractive Flowers
Attracts Pollinators
Buffer
Colorful
Defines Paths
Easy to Grow
Edible fruit
Fragrance
Pieces Used in Games
Screening
Shade
Sound
Textural
Wildlife Cover/Habitat
Wildlife Food Source
Wildlife Larval Host
Wildlife Nesting
Wind Break
Wind Shimmer

Asclepias syriaca Fruit

Asclepias syriaca: Fruit Description

Fruit a hairy and spiked gray follicle dry and inflated, 2"-4" long 1 2/3" wide erect, with a thick end and tapered tip. It has many hair-tufted seeds that are wind dispersed. Seed pod has a warty appearance and is used in dried flower arrangments. Displays from July through September

Asclepias syriaca: Fruit Type

Achene
Aggregate
Berry
Capsule
Caryopsis
Drupe
Follicle
Legume
Nut
Pome
Samara
Schizocarp
Siliqua

Asclepias syriaca: Fruit Color

grass
Gray/Silver

Asclepias syriaca: Fruit Value To Gardener

Edible
Fragrant
Good Cut
Good Dried
Long Bloom Season
Long-lasting
Showy

Asclepias syriaca: Display/Harvest Time

Fall
Spring
Summer
Winter

Asclepias syriaca: Fruit Length

< 1 inch
1-3 inches
> 3 inches

Asclepias syriaca: Fruit Width

< 1 inch
1-3 inches
> 3 inches

Asclepias syriaca Flowers

Asclepias syriaca: Flower Description

2- to 3-in., domed umbel of dusty pink or lavender 5 petaled flowers with up to 100 flowers per cluster and 1-3 clusters per stem. They grow in the leaf axis; often drooping. The bloom season is long-lasting from June through August.

Asclepias syriaca: Flower Color

filter_vintage
Green
filter_vintage
Pink
filter_vintage
Purple/Lavender
filter_vintage
White

Asclepias syriaca: Flower Inflorescence

Catkin
Corymb
Cyme
Head
Insignificant
Panicle
Raceme
Solitary
Spadix
Spike
Umbel

Asclepias syriaca: Flower Value To Gardener

Edible
Fragrant
Good Cut
Good Dried
Long Bloom Season
Long-lasting
Showy

Asclepias syriaca: Flower Bloom Time

Winter
Spring
Summer
Fall

Asclepias syriaca: Flower Petals

2-3 rays/petals
4-5 petals/rays
6 petals/rays
7 - 20 petals/rays
asymmetrical petals
Bracts
Colored Sepals
fused petals
more than 20 petals/rays
Tepals

Asclepias syriaca: Flower Size

1-3 inches
3-6 inches
< 1 inch
> 6 inches

Asclepias syriaca Leaves

Asclepias syriaca: Leaf Description

3- to 12-inch, thick light green opposite, oblong leaves; downy underside; reddish veins, rounded at both ends or abruptly pointed at the tip. Milky sap when crushed.

Asclepias syriaca: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Asclepias syriaca: Leaf Color

spa
Green

Asclepias syriaca: Leaf Type

Compound (Pinnately , Bipinnately, Palmately)
Fronds
Needles
Sheath
Simple

Asclepias syriaca: Leaf Arrangement

Alternate
Opposite
Other/more complex
Rosulate
Whorled

Asclepias syriaca: Leaf Shape

Acicular
Auriculate
Cordate
Cuneate
Deltoid
Elliptical
Filiform
Lanceolate
Linear
Oblanceolate
Oblong
Obovate
Obtuse
Orbicular
Ovate
Palmasect
Palmatifid
Peltate
Pinnatifid
Pinnatisect
Reniform
Rhomboidal
Spatulate
Subcordate
Subulate

Asclepias syriaca: Hairs Present

No
Yes

Asclepias syriaca: Leaf Length

< 1 inch
1-3 inches
3-6 inches
> 6 inches

Asclepias syriaca: Leaf Feel

Fleshy
Glossy
Leathery
Papery
Prickly
Rough
Rubbery
Slippery
Smooth
Soft
Velvety
Waxy

Asclepias syriaca Stem

Asclepias syriaca: Stem Description

Have a milky liquid when crushed.

Asclepias syriaca: Stem Color

grass
Green

Asclepias syriaca: Stem Is Aromatic

No
Yes

Asclepias syriaca Poisonous to Humans

Asclepias syriaca: Poison Symptoms

TOXIC ONLY IF LARGE QUANTITIES EATEN. Vomiting, stupor, weakness, spasms.

Asclepias syriaca: Poison Toxic Principle

Cardiac glycosides and resinoids

Asclepias syriaca: Poison Severity

High
Low
Medium

Asclepias syriaca: Causes Contact Dermatitis

No
Yes

Asclepias syriaca: Poison Part

Bark
Flowers
Fruits
Leaves
Roots
Sap/Juice
Seeds
Stems

Asclepias syriaca Whole Plant Traits

Asclepias syriaca: Plant Type

Annual
Bulb
Carnivorous
Edible
Epiphyte
Fern
Ground Cover
Herb
Herbaceous Perennial
Houseplant
Mushroom
Native Plant
Ornamental Grasses and Sedges
Perennial
Poisonous
Rose
Shrub
Succulent
Tree
Turfgrass
Vegetable
Vine
Water Plant
Weed
Wildflower

Asclepias syriaca: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Asclepias syriaca: Habit/Form

Arching
Ascending
Broad
Cascading
Climbing
Clumping
Columnar
Conical
Creeping
Dense
Erect
Horizontal
Irregular
Mounding
Multi-stemmed
Multi-trunked
Open
Oval
Prostrate
Pyramidal
Rounded
Spreading
Vase
Weeping

Asclepias syriaca: Growth Rate

Slow
Medium
Rapid

Asclepias syriaca: Maintenance

Low
Medium
High

Asclepias syriaca Cultural Conditions

Asclepias syriaca: Light

Dappled Sunlight (Shade through upper canopy all day)
Deep shade (Less than 2 hours to no direct sunlight)
Full sun (6 or more hours of direct sunlight a day)
Partial Shade (Direct sunlight only part of the day, 2-6 hours)

Asclepias syriaca: Soil Drainage

Frequent Standing Water
Good Drainage
Moist
Occasional Flooding
Occasionally Dry
Occasionally Wet
Very Dry

Asclepias syriaca: Available Space To Plant

12 inches-3 feet
12-24 feet
24-60 feet
3 feet-6 feet
6-feet-12 feet
Less than 12 inches
more than 60 feet

Asclepias syriaca: NC Region

Coastal
Mountains
Piedmont

Asclepias syriaca: USDA Plant Hardiness Zone

thermostat
3a
thermostat
3b
thermostat
4a
thermostat
4b
thermostat
5a
thermostat
5b
thermostat
6a
thermostat
6b
thermostat
7a
thermostat
7b
thermostat
8a
thermostat
8b
thermostat
9a
thermostat
9b

Asclepias syriaca: Soil Texture

Clay
High Organic Matter
Loam (Silt)
Sand
Shallow Rocky

Asclepias syriaca Landscape

Asclepias syriaca: Landscape Theme

Asian Garden
Butterfly Garden
Children's Garden
Cottage Garden
Cutting Garden
Drought Tolerant Garden
Edible Garden
English Garden
Fairy Garden
Garden for the Blind
Native Garden
Nighttime Garden
Pollinator Garden
Rain Garden
Rock Garden
Shade Garden
Water Garden
Winter Garden

Asclepias syriaca: Resistance To Challenges

Black Walnut
Compaction
Deer
Diseases
Drought
Dry Soil
Erosion
Fire
Foot Traffic
Heat
Heavy Shade
Humidity
Insect Pests
Pollution
Poor Soil
Rabbits
Salt
Slugs
Squirrels
Storm damage
Urban Conditions
Voles
Wet Soil
Wind

Asclepias syriaca: Landscape Location

Coastal
Container
Hanging Baskets
Houseplants
Lawn
Meadow
Naturalized Area
Near Septic
Patio
Pond
Pool/Hardscape
Recreational Play Area
Riparian
Rock Wall
Slope/Bank
Small Space
Vertical Spaces
Walkways
Woodland

Asclepias syriaca: Attracts

Bats
Bees
Butterflies
Frogs
Hummingbirds
Moths
Pollinators
Predatory Insects
Reptiles
Small Mammals
Songbirds
Specialized Bees

Asclepias syriaca: Problems

Allelopathic
Contact Dermatitis
Frequent Disease Problems
Frequent Insect Problems
Invasive Species
Malodorous
Messy
Poisonous to Humans
Problem for Cats
Problem for Children
Problem for Dogs
Problem for Horses
Short-lived
Spines/Thorns
Weak Wood
Weedy