Hardy perennial with magnificent steel-blue flower-heads.
Excellent for borders, the less tall species more suitable for rock gardens. Plant in full sun.
Fairly sandy, very well-drained, chalky soil.
Species from, hybrids by division.
Eryngium alpinum: Height 60-80 cm; beautiful steel-blue flower-heads in mid to late summer. Not very easy to cultivate.
Eryngium X oliveranum: Height 75-125 cm; steel-bluefrom mid summer to early autumn. Eryngium planum: Height 80-120 cm; smaller, amethyst-blue flowers in early to mid summer. ‘Blauer Zwerg’, deep blue, is only 80 cm in height. This is the strongest species; including the dwarf form it is the one most frequently used in borders.