Photo by Melody

PlantFiles: Southern Star, Tweedia
Oxypetalum coeruleum 'Heavenborn'

Family: Asclepiadaceae (ass-kle-pee-ad-AY-see-ee) (Info)
Genus: Oxypetalum (oks-ee-PET-al-um) (Info)
Species: coeruleum (ko-er-OO-lee-um) (Info)
Cultivar: Heavenborn

Synonym:Tweedia coerulea
Synonym:Amblyopetalum coeruleum

8 members have or want this plant for trade.

Tropicals and Tender Perennials
Vines and Climbers

12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)

15-18 in. (38-45 cm)
18-24 in. (45-60 cm)

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)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
Light Blue

Bloom Time:
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall


Other details:
May be a noxious weed or invasive
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
From softwood cuttings
From seed; direct sow outdoors in fall
From seed; sow indoors before last frost
From seed; direct sow after last frost

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds
Properly cleaned, seed can be successfully stored

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to view:

By Happenstance
Thumbnail #1 of Oxypetalum coeruleum by Happenstance

By gracefulkennedy
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By AnitaStamper
Thumbnail #3 of Oxypetalum coeruleum by AnitaStamper

By lupinelover
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By Happenstance
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By Happenstance
Thumbnail #6 of Oxypetalum coeruleum by Happenstance


2 positives
1 neutral
No negatives

Gardeners' Notes:

Positive derbeh On Aug 12, 2009, derbeh from Los Angeles, CA (Zone 10a) wrote:

although this plant is not as close a relative to common milkweeds as some other cultivars, the first year i had my plant, it was feasted upon by a monarch butterfly larva, which subsequently molted (off-plant) into a beautiful butterfly. i guess this plant is closely enough related to be tasty to the butterfly larvae.

Positive vossner On Aug 7, 2008, vossner from Richmond, TX (Zone 9a) wrote:

aka blue butterfly weed. just purchased it, no experience yet.
08/2009 Be very skimpy w/ water; it rots easily. Mine is planted inground, bright shade and now that I know it likes it dry, it is doing well. Flowers are a unique blue and beautiful. I'm noticing butterflies hovering around. I would not call it invasive in my garden.

Neutral lupinelover On Aug 12, 2002, lupinelover from Grove City, OH (Zone 6a) wrote:

Plant was purchased already blooming; somewhat leggy. Failure to remove seedpods in a timely manner will result in the death of this plant. Failure to dispose of seedpods will result in many germinating the following season which will probably not be as good as the hybrid desired.


This plant has been said to grow in the following regions:

Toney, Alabama
Clayton, California
Fullerton, California
Los Angeles, California
Deland, Florida
Snellville, Georgia
Eupora, Mississippi
Hattiesburg, Mississippi
Elizabeth City, North Carolina
Atlanta, Texas
Austin, Texas
Brenham, Texas
Garland, Texas
Houston, Texas

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