Asclepias Species, Spider Milkweed, Antelope Horns

Asclepiasasperula

Family
Apocynaceae (a-pos-ih-NAY-see-ee)
Genus
Asclepias (ass-KLE-pee-us)
Species
asperula (as-PAIR-uh-luh)
Synonym
Asclepias asperula
Asclepiodora asperula
Sun Exposure
Full Sun
Foliage
Herbaceous
Height
12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
Spacing
12-15 in. (30-38 cm)
Hardiness
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
Danger
Parts of plant are poisonous if ingested
Bloom Color
Pale Green
White/Near White
Bloom Time
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Other Details
Category
Perennials
Water Requirements
Requires consistently moist soil; do not let dry out between waterings
Foliage Color
Where to Grow
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
May be a noxious weed or invasive
Soil pH requirements
Patent Information
Non-patented
Propagation Methods
From seed; direct sow outdoors in fall
From seed; stratify if sowing indoors
Seed Collecting
Allow pods to dry on plant; break open to collect seeds
Properly cleaned, seed can be successfully stored
Regional

This plant is said to grow outdoors in the following regions:

Ada, Oklahoma

Oklahoma City, Oklahoma

Abilene, Texas

Arlington, Texas

Austin, Texas(4 reports)

Brownwood, Texas

Crawford, Texas

De Leon, Texas

Dripping Springs, Texas

Fort Worth, Texas

Granbury, Texas

Helotes, Texas

Pasadena, Texas

Leesburg, Virginia

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Gardener's Notes:

5
positives
0
neutral
0
negative
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L
L
Austin, TX | October 2010 | positive

Being a newcomer to Texas, I had never seen this plant before spotting it this past spring, in the pasture next to the property that now ...Read More

E
Comanche county, TX (Zone 8a) | March 2009 | positive

Many native plants don't appear in my area unless we've had sufficient winter and spring rains, but asclepias is always dependable, but s...Read More

S
Dripping Springs, TX | April 2007 | positive

This plant is an important food for Monarch and Queen butterfly caterpillars. We live in the Texas Hill Country and this plant is abundan...Read More

F
Josephine, Arlington, TX (Zone 8a) | November 2006 | positive

Spider Milkweed, Antelope Horns Asclepias asperula is native to Texas and other States.

T
Temple, TX | April 2006 | positive

My soil is Blackland Prairie; alkaline. This beautiful plant grows wild in my back 1/2 acre as a native wildflower. Am trying to establ...Read More

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