Back to Glossary
Cup Plant
Silphium perfoliatum
Cup Plant, stands out in the garden with its distinctive foliage and striking yellow flowers. The leaves of this plant form a cup shape around the square stems, creating natural reservoirs that catch and hold rainwater, providing hydration for birds and insects. From mid-summer to early fall, it produces clusters of large, daisy-like flowers on stems that can reach up to 8 feet tall. This vigorous grower is perfect for back borders, wildlife gardens, and naturalized areas, where its height and flowers make a dramatic impact.
Details
Height60” - 120”
Spread36"
Bloom SeasonJuly – September
Soil Types
Clay
Loam
Sand
Soil Moisture
Medium
Moist
Wet
Sun Exposure
Part Sun
Full Sun
Range Map
Available
Not available
Ecological Benefits
Maintenance Tips
- Deadhead spent blooms to encourage additional flowering and prevent excessive spread through seeding.
- Divide in spring or autumn every few years to maintain vigor and control spread.
- Provide support for tall stems in exposed areas to prevent them from falling over in strong winds.





