Eryngium Giganteum Seeds - Flower Plant

Eryngium Giganteum is a biennial to short-lived perennial flowering plant valued for its silvery-blue foliage, striking spiny flower heads, and upright growth habit. It is commonly grown in borders, cottage gardens, rock gardens, and drought-tolerant landscapes. The plant performs best in full sun with well-drained soil and adapts well to a variety of temperate growing conditions. Suitable for ornamental gardens, Eryngium Giganteum provides unique texture and long-lasting seasonal interest.

Features

• Biennial to short-lived perennial with an upright growth habit
• Produces silvery-blue 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 giganteum
• Common Name (US): Giant Sea Holly
• Seed Type / Variety: Flower Seed
• Growth Habit: Upright biennial to short-lived 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: 36–48 in tall, 18–24 in spread
• Plant Spacing: 18–24 in apart