Taxonomy

Division:

Magnoliophyta | - Flowering plants

Family:

Asteraceae

Genus:

Helianthus

Species:

Helianthus ×ambiguus

USDA Symbol:

HEAM7

Growth Characteristics

Life Cycle:

Perennial

Growth Habit:

Forb/herb

Height:

200 cm

Drought Tolerance:

Medium

Bloom Months:

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

Fire Ecology:

Fire adapted — tolerates or benefits from fire

Fire Notes:

Resprouts from rhizomes following fire; benefits from periodic burning in prairie systems.

Soil Requirements

Soil Type:

sandy, well-drained, nutrient-poor soil

pH:

6.0 - 7.5 (slightly acidic to neutral)

Drainage:

excellent drainage required

Moisture:

dry to moderate

Notes:

native to sandy prairies and open areas

Propagation & Germination

Stratification:

Cold/moist stratification required — 30–90 days

Germination Time:

7–21 days

Notes:

Seeds germinate readily with light and moderate warmth after cold stratification.

The above propagation data sourced from Claude AI