Photo by Melody

PlantFiles: Starry Rosinweed
Silphium asteriscus

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Silphium (SIL-phee-um) (Info)
Species: asteriscus (ass-ter-IS-kus) (Info)

2 vendors have this plant for sale.


Unknown - Tell us

Unknown - Tell us

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

Sun Exposure:
Full Sun
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
Bright Yellow

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


Other details:
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; sow indoors before last frost

Seed Collecting:
Unknown - Tell us

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By redzone911
Thumbnail #1 of Silphium asteriscus by redzone911

By redzone911
Thumbnail #2 of Silphium asteriscus by redzone911

By Floridian
Thumbnail #3 of Silphium asteriscus by Floridian


No positives
2 neutrals
No negatives

Gardeners' Notes:

Neutral kbjanet2003 On Sep 19, 2013, kbjanet2003 from mid-Michigan, MI wrote:

I grew this plant easily from some seed given to me. I do not know how old the seed was. I sowed it in spring indoors and by August I had 4 to 5 foot plants. Easy to germinate and grow. Since I am in zone 5 I am not sure it will be winter hardy.

Neutral GGT51 On Jun 25, 2013, GGT51 from Crystal River, FL wrote:

One day the plant was beautiful and full of blooms and about 4' tall. The next day it was dying. Anyone know what could cause this? I pulled up the plant and didn't see anything wrong with the roots.


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

Gainesville, Florida
Largo, Florida
Lutz, Florida
Ocala, Florida
Odessa, Florida
Oldsmar, Florida
Saint Petersburg, Florida

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