Silver Sea Holly Seeds - Flower Plant

Silver Sea Holly is a perennial flowering plant valued for its silvery-blue foliage, spiny flower bracts, and upright clump-forming growth habit. It is commonly grown in garden beds, borders, rock gardens, cottage gardens, and drought-tolerant landscapes. The plant performs best in full sun with well-drained soil and adapts well to dry, temperate growing conditions. Suitable for ornamental gardens, Silver Sea Holly provides distinctive texture and seasonal color throughout the growing season.

Features

• Perennial flowering plant with silvery-blue foliage
• Produces spiny, ornamental flower heads
• Suitable for borders, rock gardens, and cottage gardens
• Adaptable to dry and temperate growing conditions
• Performs well in full sun
• Suitable for ornamental landscape plantings

Specifications

• Scientific Name: Eryngium planum
• Common Name (US): Silver Sea Holly
• Seed Type / Variety: Flower Seed
• Growth Habit: Upright, clump-forming perennial
• USDA Zones: 4–9
• Planting Season: Spring or Fall
• Growing Season: Spring to Summer
• Sowing Season: Fall to Early Spring
• Sowing Season Months: September–April
• Germination: 21–45 days at 60–70°F (16–21°C); cold stratification may improve germination
• Sunlight Requirements: Full Sun
• Soil Requirements: Well-drained sandy or loamy soil
• Watering Needs: Low to Moderate
• Mature Plant Size: 24–36 in tall, 12–18 in spread
• Plant Spacing: 12–18 in apart