Asclepias Species, Showy Milkweed, Showy Butterfly Weed, Creek Milkweed, Greek Milkweed

Asclepias speciosa

Family
Apocynaceae (a-pos-ih-NAY-see-ee)
Genus
Asclepias (ass-KLE-pee-us)
Species
speciosa (spee-see-OH-suh)
Synonym
Asclepias douglasii
Asclepias giffordii
Sun Exposure
Full Sun
Foliage
Herbaceous
Succulent
Height
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)
Spacing
24-36 in. (60-90 cm)
Hardiness
USDA Zone 3a: to -39.9 °C (-40 °F)
USDA Zone 3b: to -37.2 °C (-35 °F)
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
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)
USDA Zone 9b: to -3.8 °C (25 °F)
Danger
Parts of plant are poisonous if ingested
Bloom Color
Pink
Medium Purple
Bloom Time
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
Grow outdoors year-round in hardiness zone
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
Soil pH requirements
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
Patent Information
Non-patented
Propagation Methods
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
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:

Flagstaff, Arizona

Sun City, Arizona

Brentwood, California

Calistoga, California

Janesville, California

Laguna Beach, California

Long Beach, California

Richmond, California

San Jose, California

San Leandro, California

San Marcos, California

Susanville, California

Westminster, California

Colorado Springs, Colorado

Golden, Colorado

Laporte, Colorado

Paonia, Colorado

Bokeelia, Florida

Potlatch, Idaho

Rock Rapids, Iowa

Barbourville, Kentucky

Eveleth, Minnesota

Minneapolis, Minnesota

Helena, Montana

Oklahoma City, Oklahoma

Cottage Grove, Oregon

Portland, Oregon

Wilkes Barre, Pennsylvania

Austin, Texas

Magna, Utah

Salt Lake City, Utah

South Jordan, Utah

Bonney Lake, Washington

Orchards, Washington

Prairie Ridge, Washington

show all

Featured Videos

Gardener's Notes:

5
positives
2
neutrals
0
negative
Sort By:
Sort By:
C
C
Sumner, WA | August 2018 | positive

Seeds were planted mid-June 2017, but did not flower the first year. In 2018, 5 plants came up with the tallest at 54"; one is now with a...Read More

S
San Jose, CA | August 2017 | positive

I am in zone 9b (South San Jose, CA) with extremely heavy clumpy clay soil. I was unsuccessful in planting over thirty milkweed seeds th...Read More

C
ROSLINDALE, MA | March 2016 | neutral

Not as a attractive as butterfly weed (A. tuberosa) or swamp milkweed (A. incarnata), which are also excellent food sources for Monarch b...Read More

A
Lubbock, TX (Zone 7b) | December 2008 | positive

Free seeds for Asclepias speciosa may be obtained through LiveMonarch.org on their website. Milkweed is the ONLY larval food source for t...Read More

D
Los Fresnos, TX (Zone 10a) | July 2008 | positive

This plant may grow in Zone 10 with good care. To grow them in Zone 10 from seeds use Cold Moist Stratification for a 1-2 months then plant.

W
Eveleth, MN (Zone 3a) | October 2005 | positive

I have been growing this species for several years in N MN. It has done fine in average garden soil and tolerates some drought. It does...Read More

S
Oklahoma City, OK (Zone 7a) | December 2004 | neutral

This plant attracts bees and butterflies. The flowers are pinkish-whitish and reach a height of 28". They look like a cluster of litt...Read More

Featured
Bignonia Species
(Bignonia capreolata)
Red Harvester Ant
(Pogonomyrmex barbatus)
Eurasian Bittern
(Botaurus stellaris)
Featured
Bignonia Species
(Bignonia capreolata)
Red Harvester Ant
(Pogonomyrmex barbatus)
Eurasian Bittern
(Botaurus stellaris)