A striking and resilient perennial, Eryngium planum, commonly known as Flat Sea Holly, brings bold texture and architectural structure to the garden. Its spiky, metallic-blue flowers sit atop stiff, branching stems, creating a shimmering effect in the summer sun.
As the season progresses, the flower heads dry beautifully, providing long-lasting interest and structure well into winter. The ruffled, blue-green basal foliage adds further appeal, making it a fantastic choice for mixed borders, prairie-style plantings, and gravel gardens. Drought-tolerant and highly attractive to pollinators, this long-flowering perennial is a magnet for bees and butterflies.
Height & Spread: Grows to around 60-90cm in height with a spread of approximately 40-50cm.
Soil: Prefers well-drained, sandy or gravelly soils; thrives in poorer conditions.
Position: Best in full sun; ideal for dry borders, gravel gardens, and coastal plantings.
Flowering Time: Midsummer to early autumn
A striking and resilient perennial, Eryngium planum, commonly known as Flat Sea Holly, brings bold texture and architectural structure to the garden. Its spiky, metallic-blue flowers sit atop stiff, branching stems, creating a shimmering effect in the summer sun.
As the season progresses, the flower heads dry beautifully, providing long-lasting interest and structure well into winter. The ruffled, blue-green basal foliage adds further appeal, making it a fantastic choice for mixed borders, prairie-style plantings, and gravel gardens. Drought-tolerant and highly attractive to pollinators, this long-flowering perennial is a magnet for bees and butterflies.
Height & Spread: Grows to around 60-90cm in height with a spread of approximately 40-50cm.
Soil: Prefers well-drained, sandy or gravelly soils; thrives in poorer conditions.
Position: Best in full sun; ideal for dry borders, gravel gardens, and coastal plantings.
Flowering Time: Midsummer to early autumn
