Scientific Name: Silphium perfoliatum
Common Name: cup plant
Native Range: Central-eastern Canada to southeastern United States
Zone: 3 to 9
Plant type & Form: Herbaceous perennial
Height: 4.00 to 8.00 feet
Spread: 1.00 to 3.00 feet
Bloom Time: July to September
Bloom Description: Yellow
Flower: flower heads (to 3″ diameter) featuring light yellow rays (20-40) and darker yellow center disks bloom in summer on the upper part of the plant
Leaf: Rough, triangular to ovate, coarsely-toothed, opposite, connate-perfoliate, medium green leaves can reach 14″ long. The leaf pairs are united at their bases, enveloping the stems.
Sun: Full
Water: Medium to wet
Soil type & pH: Prefers moist, rich soils
Maintenance: Low
Suggested Use: Naturalize, Rain Garden
Tolerates: Clay Soil, Wet Soil
Identification notes: Look for square/quadrangular stems that are 4-8′ tall
