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botanical name:
Eryngium alpinum 'Superbum'
Eryngium alpinum 'Superbum' © Deeproot Plant Base    view larger image
common name:  Alpine sea holly
family:  Apiaceae
characteristics: perennial
height: 0.90m
width: 0.60m
growth rate:
growth habit:
leaf colour: green
flower colour: blue
main season: Summer
aspect: full sun
conditions: dry soil, sandy soil, coastal
preferred soil pH: alkaline
minimum temp: -35°C
USDA zone: 4 to 9
description:
Basal rosettes of heart-shaped leaves, metallic blue, thistle-like flower heads with spiny ruffs.

cultivation:
Well drained soil in full sun. Avoid excessive winter wet. Thrives in poor stony soil and gravel.
Can be short-lived.

propagation:
From seed or root cuttings.

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