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Silphium simpsonii Greene
Simpson's Rosinweed, Tall Rosinweed
Asteraceae (Aster Family)
USDA Symbol: SISI
USDA Native Status: L48 (N)
A big perennial (up to about 4 feet) with 2-inch yellow flower heads that bloom from mid-summer to fall when hardy bloomers are appreciated. Use as a background accent.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Size Notes: Up to about 4 feet tall.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.
Bloom InformationBloom Color: Yellow
Bloom Time: Jul , Aug , Sep , Oct
Growing ConditionsWater Use: Low
Light Requirement: Sun , Part Shade
Soil Moisture: Dry , Moist
Conditions Comments: This species is a good nectar source for butterflies. Appreciates good drainage but is tolerant of a variety of soils from sand to clay.
BenefitConspicuous Flowers: yes
Nectar Source: yes
Deer Resistant: Minimal
Value to Beneficial InsectsSpecial Value to Native Bees
This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Lady Bird Johnson Wildflower Center - Austin, TX
NPSOT - Williamson County Chapter - Georgetown, TX
Mt. Cuba Center - Hockessin, DE
Web ReferenceWebref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter
Additional resourcesUSDA: Find Silphium simpsonii in USDA Plants
FNA: Find Silphium simpsonii in the Flora of North America (if available)
Google: Search Google for Silphium simpsonii
MetadataRecord Modified: 2023-01-16
Research By: TWC Staff