Taxonomy

Division:

Magnoliophyta | - Flowering plants

Family:

Asteraceae

Genus:

Cirsium

Species:

Cirsium griseum var. osterhoutii

USDA Symbol:

CIOS

Growth Characteristics

Life Cycle:

Perennial

Growth Habit:

Forb/herb

Height:

120 cm

Light Requirements:

Full Sun

Drought Tolerance:

Medium

Bloom Months:

jul,aug,sep

Bloom Colors:

white, pink

Wildlife Benefits

Bees:

★☆☆☆☆ Documented bee visitation (GBIF)

Butterflies & Moths:

★☆☆☆☆ Documented Lepidoptera association (GBIF)

Keystone Species Ranking

Pollen Specialist Bee Keystone:

★★★★☆ Native pollen specialist bee species supported by this genus (NWF)

Garden & Ecology Notes

Wildlife Value:

bees, butterflies, birds

Deer Resistant:

Yes

Fire Ecology:

Fire adapted — tolerates or benefits from fire

Fire Notes:

Resprouts from rootstock following fire; benefits from periodic burning to reduce competition.

Propagation & Germination

Stratification:

Cold/moist stratification required — 30–60 days

Germination Time:

14–28 days

Notes:

Light may improve germination. Seeds germinate readily after cold stratification.

The above propagation data sourced from Claude AI