Compass plant
Compass plant (Silphium laciniatum) is one of the great long-lived prairie forbs, sending a taproot 12 to 15 feet deep and orienting its deeply cut basal leaves north-south. Its large yellow flower heads feed bees and its seed feeds goldfinches, and its presence signals a serious, high-quality prairie planting.
Why landowners plant compass plant
- Root systems reaching 15 feet provide drought resilience and deep carbon storage.
- Conservative species that raises habitat-quality scoring on CRP and grant rankings.
- Large seed is a favorite of goldfinches and other seed-eating songbirds.
- Plants can live 50 to 100 years, anchoring the stand for the long term.
Site fit
Plant on deep mesic to dry-mesic prairie soils with full sun. Avoid shallow, rocky, or saturated ground where the taproot cannot develop.
Establishment
Large seed with a strong cold-moist stratification requirement — dormant seeding only. Plant 1/4 to 1/2 inch deep. Very slow: expect leaves for two or three years and first bloom in year four or five.
Management
Highly fire tolerant once established. Because seed is large and costly per pound, it is often specified at low rates or interseeded in patches.
CRP practice fit
Premium conservative forb in high-diversity rare and declining habitat mixes.
Included in high-end pollinator mixes for summer bloom and structure.
Featured mixes with compass plant
Pairs well with
Big bluestem · Indiangrass · Prairie blazing star · Gray-headed coneflower
Frequently asked questions
Compass plant has only about 9,000 seeds per pound compared with over a million for many small-seeded forbs, and plants take four to five years to produce seed. Both factors make it one of the costliest species per PLS pound in a mix.
Four to five years from seed. It invests early growth in a taproot that can reach 15 feet, then flowers reliably for decades — often outliving the CRP contract that established it.