Description +
Silphium (Silphium perfoliatum) , commonly known as Cup Plant or Rosinweed, is a hardy perennial native to North America. Known for its tall stems and bright yellow daisy-like blooms, this Yellow Silphium variety is perfect for naturalized gardens, wildflower meadows, and pollinator habitats. Its resilience and long blooming season make it a low-maintenance favorite among native plant enthusiasts.
Features:
Bright Yellow Blooms: Produces cheerful, sunflower-like flowers.
Pollinator Friendly: Attracts bees, butterflies, and other beneficial insects.
Low Maintenance: Drought and heat tolerant once established.
Tall and Elegant Growth: Ideal for natural borders and backdrops.
Long Blooming Period: Provides color from mid-summer through fall.
Specifications:
Scientific Name: Silphium perfoliatum
Common Name: Silphium, Cup Plant
Variety: Yellow Silphium
Plant Type: Perennial
USDA Hardiness Zones: 39
Light Requirement: Full sun
Soil Type: Well-drained, loamy soil
Watering Needs: Moderate; drought-tolerant once established
Planting Season: Spring or early fall
Bloom Season: Summer to fall
Mature Height: 48 feet
Spacing: 1824 inches apart
Ideal For: Pollinator gardens, wildflower meadows, and landscape borders
Planting Guide:
Sow seeds outdoors in early spring or fall. For best results, cold stratify seeds for 30 days before planting.
Plant inch deep in well-drained soil under full sun.
Water regularly during germination; reduce watering once established.
Deadhead to encourage more blooms and prevent self-seeding if desired.
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