Taxonomy

Division:

Magnoliophyta | - Flowering plants

Family:

Asteraceae

Genus:

Helianthus

Species:

Helianthus porteri

USDA Symbol:

HEPO3

Growth Characteristics

Life Cycle:

Annual

Growth Habit:

Forb/herb

Height:

150 cm

Light Requirements:

Full Sun

Drought Tolerance:

Medium

Bloom Months:

sep,oct,nov

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, butterflies, bees

Soil Requirements

Soil Type:

sandy, acidic, nutrient-poor soil

pH:

5.5 - 7.0 (slightly acidic to neutral)

Drainage:

excellent drainage required

Moisture:

dry to moderate

Notes:

commonly found in rocky or sandy open areas

Propagation & Germination

Stratification:

Cold/moist stratification required — 30–60 days

Germination Time:

14–30 days

Notes:

Seeds benefit from cold stratification for 30-60 days to break dormancy.