35 Cup Plant Silphium perfoliatum Flower Seeds - Beautiful! Sunflower

The Gardening World

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Cup Plant is a large branching perennial from the tallgrass region of the U.S. and Canada. It gets its name from the “cup” that is formed by the adjoined, opposite leaves on the stems. Plants can reach nearly 8 feet tall and produce numerous yellow flowers in summer. The extremely deep, large roots make it difficult to transplant once established. Prefers medium to moist soils. Recommended for pollinator and naturalized gardens as well as prairie plantings.

NOTE: These are not allowed to be shipped to New York.


Name: Cup Plant (Similar to sunflowers)
Scientific Name: Silphium perfoliatum
Color: Yellow
Hardiness Zones: 3-9
Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost
Plant Height: 40-90"
Plant Spacing: 24 - 36"
Cycle: Perennial
Bloom Season - Summer
Light Requirements: Full Sun
Soil & Water Preferences: Average
Other: Attracts bees, birds, & butterflies

Sowing: Direct sow in late fall, pressing into the surface of the soil. For spring planting, mix the seeds with moist sand and store in the refrigerator for 60 days before planting. Keep the soil consistently moist until germination.

Growing: Water seedlings occasionally until they become established. Mature plants prefer slightly dry soil and tolerate drought, in addition to growing well in clay or sandy soils. This plant attracts bees, butterflies, and birds. It will self-seed and can spread rapidly.

All multiple orders of the same seed are put in the same bag. For example if you order 500 beefsteak tomato seeds x 3 then 1500 seeds will be put in the same bag. We do not send out 3 individual bags with 500 in each. This goes for all seeds unless they are listings of different seeds.


If you can’t find germinating and instructions online you can find them on the item page. Our goal is to save money everywhere we can so we can pass those savings on to you.

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