Rosinweed (Silphium integrifolium) is a structural plant with yellow flowers that bloom from early summer through fall. They prefer mesic to dry soil in full sun where they can grow to 6 feet tall. When planted in moist, fertile soil, they tend to flop, so they’re best suited for drier banks. Companion plants include Royal Catchfly (Silene regia) and Prairie Dropseed (Sporobolus heterolepis).
Maintenance
Plants may need staking once blooming begins. Though birds eat the seeds post-bloom, consider deadheading to prevent aggressive spread.
About
Light Requirements
Sun Moisture Requirements
Banks Soil Requirements
Clay,
Loam,
Rock Height
Tall Spacing
2 to 3 feet Category
Seasonal,
Structural Attracts
Bees,
Birds,
Butterflies Illinois Native Plant Status
Illinois Native,
Indiana Native Bloom Time
July,
August,
September Bloom Color
Yellow Seasonality
Fall,
Summer,
Winter Sociability
Individuals, Groups up to 5