Asteraceae
Silphium perfoliatum var. perfoliatum
Silphium perfoliatum var. perfoliatum var. perfoliatum
Also known as Silphium perfoliatum f. petiolatum, Silphium petiolatum, Silphium erythrocaulon, Silphium conjunctum
Flowering Plants · Native Plants · Cup Plant · Silphium · Native Perennial · Tall Perennial · Yellow Flowers · Wildlife Garden · Prairie Plant · Pollinator · Asteraceae · Rain Garden
Cup plant is a vigorous, fast-growing native perennial that produces cheerful yellow daisy-like flowers atop tall, square stems throughout summer and into fall. Its distinctive perfoliate leaves form a cup that collects rainwater, providing a natural drinking source for birds and insects. Plant it in average to moist soil with partial to full sun and give it plenty of room, as it can reach 6–8 feet tall.
Growing conditions
The details behind the basics
- Daily light
- 5 hours
- Watering
- Water thoroughly until soil is moist; tolerates brief dry periods once established · Every 7-14 days
- Maintenance
- Low
- Soil
- loam
- Soil pH
- 4.5–7.5
- Temperature
- -35°F to 90°F
- Cycle
- Perennial
Hardiness
USDA 3b-9b
Form & growth
Mature size and habit
- Mature height
- 5 ft – 8 ft
- Spread
- 3 ft
- Spacing
- 36 in apart
- Growth rate
- Fast
- Root depth
- Deep
- Flowers
- Yellow
- Foliage
- Green · Coarse
Ecology & origin
Where it belongs and what it brings
- Native to
- Alabama, Arkansas, Austria, Belarus, Belgium, Bulgaria, Connecticut, France, Germany, Illinois, Indiana, Iowa, Italy, Kansas, Kentucky, Kirgizstan, Krym, Louisiana, Masachusettes, Michigan
- Attracts
- Bees, Butterflies, Birds
Sources: trefle
More Silphium
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