Taxonomy

Division:

Magnoliophyta | - Flowering plants

Family:

Asteraceae

Genus:

Helianthus

Species:

Helianthus nuttallii

USDA Symbol:

HENU

Growth Characteristics

Life Cycle:

Perennial

Growth Habit:

Forb/herb

Height:

300 cm

Light Requirements:

Full Sun

Drought Tolerance:

Low

Bloom Months:

jul,aug,sep,oct

Bloom Colors:

yellow

Wildlife Benefits

Bees:

★☆☆☆☆ Documented bee visitation (GBIF)

Butterflies & Moths:

★☆☆☆☆ Documented Lepidoptera association (GBIF)

Keystone Species Ranking

Caterpillar Keystone:

★★★★☆ Butterfly & moth species supported by this genus (NWF)

Pollen Specialist Bee Keystone:

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

Garden & Ecology Notes

Wildlife Value:

birds, bees, butterflies

Salt Tolerant:

Yes

Fire Ecology:

Fire adapted — tolerates or benefits from fire

Fire Notes:

Resprouts vigorously from rhizomes after fire; common in prairie and wetland margins with periodic fire regimes.

Soil Requirements

Soil Type:

moist, fertile, well-drained loam

pH:

6.0 - 7.5 (slightly acidic to neutral)

Drainage:

good drainage required

Moisture:

consistently moist

Notes:

Commonly found in wetlands and along streams

Propagation & Germination

Stratification:

Cold/moist stratification required — 30–60 days

Germination Time:

7–21 days

Notes:

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

The above propagation data sourced from Claude AI