Asteraceae
Silphium perfoliatum var. connatum
Silphium perfoliatum var. connatum var. connatum
Also known as Silphium connatum, Silphium perfoliatum subsp. connatum
Flowering Plants · Native Plants · Native Perennial · Cup Plant · Wildlife Garden · Asteraceae · Tall Perennial · Pollinator Plant · Eastern Us Native · Rain Garden · Silphium
Cup plant is a robust native perennial that thrives in moist, average soils with partial to full sun exposure. Its distinctive cup-shaped leaf bases collect rainwater, providing a drinking source for birds and insects. Once established, it requires minimal care and spreads naturally to form impressive colonies.
Growing conditions
The details behind the basics
- Daily light
- 4 hours
- Watering
- Water deeply until soil is moist; allow top inch to dry between waterings · Every 7-10 days
- Maintenance
- Low
- Soil
- loam
- Soil pH
- 4.5–7.5
- Temperature
- -10°F to 85°F
- Cycle
- Perennial
Hardiness
USDA 5a-9b
Form & growth
Mature size and habit
- Mature height
- 18 in – 3 ft
- Spread
- 2 ft
- Spacing
- 36 in apart
- Growth rate
- Fast
- Root depth
- Medium
- Flowers
- Yes
- Foliage
- Coarse
Ecology & origin
Where it belongs and what it brings
- Native to
- North Carolina, Virginia, West Virginia
- Attracts
- Bees, Butterflies, Birds
Sources: trefle
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