Helianthus petiolaris

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Helianthus Petiolaris 3 Helianthus Petiolaris 2 Helianthus Petiolaris 1 Helianthus Petiolaris
Helianthus Petiolaris 3 Helianthus Petiolaris 2 Helianthus Petiolaris 1 Helianthus Petiolaris

Helianthus petiolaris

Common Name: Prairie Sunflower

Prairie Sunflower is an annual species reaching 1 to 4 feet in height, characterized by bright yellow flowers and rough, hairy stems. It thrives in sandy or disturbed soils in prairies, roadsides, and open fields. This species can grow in clumps, but you may also see them growing on their own. This sunflower is an important food source for birds and pollinators and is well-suited for prairie plantings and dry, sunny gardens.

Characteristics

Type Forb
Sun Full Sun, Partial Sun
Soil Loam, Sand/Gravel, Calcareous
Moisture Dry, Mesic, Wet
Average Max Height (inches) 45
Suggested Plant Spacing (inches) 23
Bloom month(s) June, July, August, September
Bloom Color or Type Yellow
Dominance Medium

Range Maps

Sowing Information

For most homeowners, the recommended method is to hand-broadcast seed at a minimum rate of 16–64 PLS (Pure Live Seed) ounces per acre. To ensure even coverage, broadcast the seed in perpendicular passes across the site. Grass seed should be broadcast first and lightly raked into the soil. Afterward, apply a light mulch layer using clean, seed-free straw or, preferably, our native Little Bluestem straw, available at our retail garden centers. Once mulching is complete, broadcast native wildflower seed over the area without raking it in. A good rainfall or thorough watering will provide sufficient soil contact for successful germination.

Planting Information

Dig a hole in your planting site slightly larger than the plant’s root system. When placing the plant into the hole, ensure that the soil line remains consistent with its original level in the pot. Fill in around the roots with the excavated soil, gently firming it to eliminate air pockets. Water the plant thoroughly the same day to promote successful establishment.