Close-up photo of Silphium trifoliatum (Whorled Rosinweed) with buds and yellow flowers.

Silphium trifoliatum (Whorled Rosinweed) Unity Grown

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Silphium trifoliatum, commonly called whorled rosinweed, is a tall, perennial wildflower commonly found in a variety of open meadow environments growing to three to six feet tall. Defined by its narrow stems, whorled, lance-shaped leaves and profuse, small, yellow flowers which bloom through the late summer months, whorled rosinweed's flowers are attractive to butterflies and a number of important native bees. After flowers begin to turn to seed, the plant is also highly attractive to a number of bird species including goldfinches.

Similar in appearance to many other asters, whorled rosinweed is an important pollinator species, as well as a beneficial and versatile substitute for sunflower, and Silphium trifoliatum grows well in a variety of open woodland conditions, pollinator gardens, or open meadows.

Native to Maryland, Native to U.S., and Straight Species
Mature Plant Height: Tall: 49-72"
Deciduous
Sun (6+ hours) and Part Shade/Sun (4-6 hours of sun)
Soil Moisture: Well-drained and Medium to Dry
Soil Type: Wide Tolerance
Bloom Time: Summer
Flower Color: Yellow
Foliage color: Green
Features: Attracts Butterflies, Attracts Pollinators, Attracts Birds, and Fall Color
Tolerances: Deer Tolerant
Garden Type: Pollinator Garden, Woodland Garden, and Meadow

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