Silphium Yellow Silphium Plant Seeds

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: 3–9
• 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: 4–8 feet
• Spacing: 18–24 inches apart
• Ideal For: Pollinator gardens, wildflower meadows, and landscape borders

Planting Guide:

1. Sow seeds outdoors in early spring or fall. For best results, cold stratify seeds for 30 days before planting.
2. Plant ¼ inch deep in well-drained soil under full sun.
3. Water regularly during germination; reduce watering once established.
4. Deadhead to encourage more blooms and prevent self-seeding if desired.