ERYNGIUM planum 'Blaukappe'

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ERYNGIUM planum 'Blaukappe'

Sea Holly
[Blue Cap, Tetra Petra]
Select Item No. EA169


One Portion is usually sufficient for approx. 50 plants.
Please switch to gram for larger quantities.

Plant Description

Life Cycle: Perennial
Family: Apiaceae
Origin: Central and Southeastern Europe; Central Asia
Special Features: Intense blue flowers on wiry stems. Architecturally interesting round blossoms with spiny bracts. Outstanding as a cut flower.
Historical: Introduced by JELITTO PERENNIAL SEEDS in 1992. Originating from the sterile cultivar, 'Blauer Zwerg' (Blue Dwarf), this introduction grows a bit taller but can be easily produced by seed.
Basic Colour: (blue)
Flower Colour: intense blue
Natural Flowering Period: June - September
Winter Hardiness Zones: Z4 - Z8
Foliage: roundish, leathery, dark green basal leaves, almost spiny palmate-like, upper leaves
Growth Habit: upright, erect / sturdy
Height with Flowers: 70 cm
Spacing between Plants: 46 cm
Soil Requirements: well-drained / average
Usage: honey-bee food plant / suitable for cutting
Grams per 1000 seeds: 1.40845 Gram
Seeds per Gram
(does not correspond to the number of plants!):
Gram to get 1000 plants
(if sown directly into pots etc. you will need a larger quantity):
10 Gram
Sowing Rates/Trays: 2 - 3 per cell
Plug tray recommended size(s): open flats / 72
Sowing Direction:

(15) Rapidly germinating, keep seed in constant moisture (not wet) with temperatures of about +20°C [68°F]. Seeds must be covered thinly. Do not cover very small seeds, but tightly press into the earth. Keep in cooler conditions after germination occurs.

Best Sowing Date
(northern Hemisphere, Field condition):
November - March
Sowing to Germination: 4 - 8 weeks
Germination to Transplant: 4 - 6 weeks
Transplanting to Potting: 6 - 8 weeks
Cutting back at Transplanting: Not Necessary.
Container Size(s): 1-2 plugs per 11/12 cm (4 1/2")
Vernalization: A prudent recommendation would be to provide 6-12 weeks at an average daily temperature of 40°F (5°C). Exposure to cold may not be necessary for flowering but might improve quality.
Forcing: There has been no research, but an obvious place to experiment - following vernalization - would be raising daytime temperatures to 60° - 65°F (15° - 17°C). Provide 16 hours of continuous lighting. During the short days of winter, provide a night interruption lighting of 4 hours between 10:00 p.m. and 2:00 a.m. Some later flowering species can be forced in 14 - 16 weeks and perhaps sooner at warmer temperatures. Further experiments are warranted.
Fertilizer: Medium (150-200 ppm)
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