Silphium perfoliatum - Cup Plant

Cup Plant is tall, erect perennial plant, growing 3 to 8 feet high, on stems that are stout, square in cross-section and smooth and unbranched below the flowers.

Flowers are bright yellow blooming in mid summer. It is adapted to moist soils and full sun situations.

Look for Cup Plant in our Privacy Pollinator Fence Native Seed Mix. This popular mix creates a border brimming with tall growing perennial wildflowers. Watch it buzz with life all growing season long!

How To Plant Cup Plant:

Direct sow seeds into prepared soil in late fall once soil temps are below 50 degrees (usually mid to late November). Can also be planted in winter during natural freeze / thaw cycles and early spring. Plant shallow, no deeper than 1/8 to 1/4 inch deep and lightly rake to work seed in. Plant in full sun to partial shade. Can take two to three growing seasons to fully establish. 

What is Stratification?

Seed Info

Seed Envelopes contain approximately 0.02 ounces of seed and cover about 5 to 10 square feet. 

Product Details

Flower Color: Yellow

Height: 3 to 8 Feet

Light Requirements: Full Sun to Partial Shade

Soil Hydrology: Dry to Wet Soils

Bloom Time: July to September

Plant Type: Perennial

Stratification: Cold Moist (CM) 60 Days

Attracts: Birds, Butterflies, Bees, Hummingbirds

Product Code: SIL05F