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Smith, R.W.

Silphium simpsonii

Silphium simpsonii Greene

Simpson's Rosinweed, Tall Rosinweed

Asteraceae (Aster Family)

Synonym(s):

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

1 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
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 Information

Bloom Color: Yellow
Bloom Time: Jul , Aug , Sep , Oct

Distribution

USA: FL

Growing Conditions

Water 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.

Benefit

Conspicuous Flowers: yes
Attracts: Butterflies
Nectar Source: yes
Deer Resistant: Minimal

Value to Beneficial Insects

Special Value to Native Bees

This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.

From the National Organizations Directory

According 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 Reference

Webref 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 resources

USDA: Find Silphium simpsonii in USDA Plants
FNA: Find Silphium simpsonii in the Flora of North America (if available)
Google: Search Google for Silphium simpsonii

Metadata

Record Modified: 2023-01-16
Research By: TWC Staff

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