Cup Plant (Silphium perfoliatum var. perfoliatum) in the Silphiums Database

General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Minimum cold hardiness: Zone 3 -40 °C (-40 °F) to -37.2 °C (-35)
Maximum recommended zone: Zone 9b
Plant Height: 36 - 120 inches
Plant Spread: 24 - 48 inches
Fruit: Edible to birds
Flowers: Showy
Flower Color: Yellow
Bloom Size: 1"-2"
2"-3"
Flower Time: Summer
Late summer or early fall
Uses: Will Naturalize
Edible Parts: Fruit
Wildlife Attractant: Bees
Birds
Butterflies
Containers: Not suitable for containers

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