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PlantFiles: Slender Rosinweed
Silphium gracile

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Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Silphium (SIL-phee-um) (Info)
Species: gracile (GRASS-uhl) (Info)

Category:
Perennials

Height:
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)

Spacing:
24-36 in. (60-90 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)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Full Sun
Sun to Partial Shade

Danger:
Unknown - Tell us

Bloom Color:
Bright Yellow

Bloom Time:
Late Spring/Early Summer
Mid Summer

Foliage:
Herbaceous

Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing the rootball
From seed; direct sow outdoors in fall

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored

Profile:

1 positive
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive dmj1218 On Aug 27, 2006, dmj1218 from west Houston, TX (Zone 9a) wrote:

This plant is native to the prairies, long-leaf pine savannahs, and roadsides in southeast Texas to Aransas county and east into Louisiana and is rarely found anymore in Texas in its pure form. This is because it's genetic integrity is comprimized due to the fact that it hybridizes easily with the taller, more aggressive native Silphiums such as S. laciniatum (compass plant), S. albiflorum (white rosinweed), and S. radula (roughstem rosinweed).

Slender rosinweed is usually about knee-high and is a well behaved garden plant prefering acidic sandy to sandy loam soils that are well-drained. The 2-3" blooms are a large translucently clear yellow. The plant colonizes by rhizomes and is easily grown from seed or by dividing the rootball while dormant in winter.

Regional...

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

Houston, Texas



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