Compass Plant (Silphium laciniatum)

Compass Plant (Silphium laciniatum) 

Compass plant is a tall, sunflower‑like perennial native to the tallgrass prairie. Mature plants commonly reach six to ten feet, with exceptional individuals approaching twelve. Stems are stout and bristly, and often used by goldfinches and other prairie birds as perches. The plant’s deep root system is one of its defining traits. Roots regularly extend ten feet or more, with documented cases exceeding fifteen, giving the plant strong drought tolerance and anchoring it firmly in open prairie soils.

Bright yellow flower heads appear along the upper portion of the stem. Each head is typically two to four inches across, occasionally larger, and attracts a wide range of pollinators. At the base, the plant produces large, deeply cut, hairy leaves up to two feet long. These basal leaves often align roughly north–south, a trait that inspired the common name. Leaves higher on the stem are smaller and more widely spaced.

Compass plant thrives in full sun and prefers dry to moderately moist, well‑drained soils. It is characteristic of tallgrass prairies and is widely used in restoration because of its longevity, deep rooting, and ability to withstand drought and fire.

Source list:

Flora of North America – Silphium laciniatum

UW–Madison Herbarium – Silphium laciniatum

Illinois Wildflowers – Compass Plant

Minnesota Wildflowers – Compass Plant

USDA Plants Database – Silphium laciniatum

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