General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Water Preferences: Mesic
Dry Mesic
Dry
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Minimum cold hardiness: Zone 7b -15 °C (5 °F) to -12.2 °C (10 °F)
Plant Height: 3 feet
Plant Spread: 10 - 15 inches
Leaves: Deciduous
Flowers: Inconspicuous
Flower Color: Blue
Bloom Size: Under 1"
Flower Time: Summer
Late summer or early fall
Fall
Underground structures: Taproot
Suitable Locations: Xeriscapic
Uses: Cut Flower
Dried Flower
Wildlife Attractant: Bees
Butterflies
Other Beneficial Insects
Resistances: Drought tolerant
Propagation: Seeds: Self fertile
Propagation: Other methods: Cuttings: Root
Division
Pollinators: Beetles
Flies
Bees
Miscellaneous: Tolerates poor soil
Awards and Recognitions: Other: RHS Plants for Pollinators

Image
Common names
  • Sea Holly
Also sold as:
  • Blaukappe

Photo Gallery
Location: Ann Arbor, Michigan
Date: 2024-06-14
Soon to "bloom"
Location: Newby Hall, Yorkshire UK
Date: 2024-06-19
Location: National Botanical Garden (DC) | November 2022
Date: 2022-11-26
Location: Newby Hall, Yorkshire UK
Date: 2018-06-15

Photo Courtesy of Select Seeds. Used with permission.
  • Uploaded by Joy

Courtesy Crownsville Nursery
  • Uploaded by vic

Photo courtesy of Select Seeds
  • Uploaded by Joy
Plant Events from our members
dnrevel On March 29, 2023 Seeds germinated
Germinated, but seedlings are struggling, need drier soil. Soil was too wet on heat mat and lost several to damping off before turning the fan on. Sprinkled cinnamon on surface, drained out water, put in greenhouse for other seedlings that are just germinating. Cooler temps might help.
dnrevel On March 5, 2023 Seeds sown
Swallowtail garden seeds. Needs light to germinate. Sowing in green cell packs. Will place outside for chilling.
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