General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Minimum cold hardiness: Zone 2 -45.6 °C (-50 °F) to -42.8 °C (-45°F)
Flower Color: Yellow
Bloom Size: Under 1"
Flower Time: Late spring or early summer
Underground structures: Taproot
Suitable Locations: Alpine Gardening
Containers: Needs excellent drainage in pots

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Location: Allentown, Pennsylvania
Date: 2015-05-09
Location: Allentown, Pennsylvania
Date: 2015-06-11
impressively spiny
Location: Allentown, Pennsylvania
Date: 2015-05-08
Location: My garden, Calgary, Alberta, Canada; zone 3.
Date: 2012 spring-summer
Plant will become spherical and armoured with spines as it mature
Location: My garden, Calgary, Alberta, Canada; zone 3.
Date: 2010

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