Cup Plant
Silphium perfoliatum
Family: Asteraceae
Cup Plant grows in full sun and prefers moist, rich soil. Water needs: Moderate.
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How to Grow Cup Plant
Cup Plant growing information includes sunlight requirements of Full sun, soil conditions listed as Moist, rich soil with a soil pH of 5.5-7.5, and Moderate water needs. The listed hardiness zones are 3-9. For propagation reference, the database lists germination or establishment information for Cup Plant as 21-60 days after stratification, with planting or establishment depth listed as 1/4 inch. Days to maturity are listed as 2-3 years.
Plant Overview
Cup Plant (Silphium perfoliatum) is listed in the Asteraceae family and categorized as a flower with a perennial life cycle. This profile summarizes growing information for hardiness, light, soil, water, seed starting, maturity, and other available cultivation details. Difficulty is listed as Easy.
- Plant ID
- PLT-0427
- Family
- Asteraceae
- Plant type
- Flower
- Life cycle
- Perennial
- Difficulty
- Easy
Growing Conditions
Cup Plant is listed for full sun conditions. Water needs are listed as moderate. The database soil reference is Moist, rich soil. The listed soil pH range is 5.5-7.5, and the listed hardiness range is 3-9.
- Hardiness zones
- 3-9
- Sunlight
- Full sun
- Soil
- Moist, rich soil
- Soil pH
- 5.5-7.5
- Water needs
- Moderate
Seed & Germination
For seed starting, the listed germination time is 21-60 days after stratification and the seed depth is 1/4 inch. The listed time to maturity is 2-3 years. Use these values as general reference points and adjust for local climate, seed source, and growing conditions.
- Germination
- 21-60 days after stratification
- Seed depth
- 1/4 inch
Harvest & Propagation
- Days to maturity
- 2-3 years
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Growing Reference Note
Plant performance can vary with climate, soil, weather, cultivar, seed quality, and gardening methods. The values on this page are general database reference ranges rather than a substitute for local extension guidance or seed-packet instructions.