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Jelitto · Seeds of more than 3700 different species and varieties
ERYNGIUM alpinum 'Blue Star®'
Plant Description
| Life Cycle: | Perennial |
| Family: | Apiaceae |
| Origin: | Alpine European meadows |
| Special Features: | Especially abundant deep-blue, star-shaped blossoms on sturdy stems. Abundant flowers, especially bred for use as a cut flower, strong grower. In spite of its spiny appearance, 'Blue Star' is soft to the touch. Dislikes extreme heat and humidity. |
| Historical: | Introduced by JELITTO PERENNIAL SEEDS in 1974. |
| Basic Colour: | (blue) |
| Flower Colour: | deep blue |
| Natural Flowering Period: | June - August |
| Winter Hardiness Zones: |
Z4 - Z9
|
| Foliage: | glossy, heart-shaped |
| Growth Habit: | erect / vigorous |
| Height with Flowers: | 80 cm |
| Spacing between Plants: | 60 cm |
| Soil Requirements: | dry / well-drained / average |
| Location: | |
| Usage: | honey-bee food plant / suitable for cutting |
| Grams per 1000 seeds: | 5.71429 Gram |
| Seeds per Gram (does not correspond to the number of plants!): |
175 |
| Gram to get 1000 plants (if sown directly into pots etc. you will need a larger quantity): |
15 Gram |
| Sowing Rates/Trays: | 3 per cell |
| Plug tray recommended size(s): | open flats / 72 |
| Sowing Direction: |
(1) Cold-germinators are still referred to as frost-germinators, although this isn’t quite correct. The sowing must be kept warm (about +18 to +22°C) [about 64 to 72°F] and moist for the first 2–4 weeks. After this period the sowing must be kept at a cold temperature (between –4 and +4°C) [between 25 and 39°F] for another 4–6 weeks. Colder temperatures of –5°C [23°F] are only advantageous for most species of the Ranunculus family. It is not so important if the temperature is higher or lower during the cooling period, but the cooling period has to be prolonged because the synthesis of the germination inducer, hormon-like acid, slows down or comes to a standstill. (3) These species usually show excellent results if sown soon after the harvest, although most of them only germinate in spring after the effect of winter. For best results please order seeds in time.
|
| Best Sowing Date (northern Hemisphere, Field condition): |
late autumn - early spring |
| Sowing to Germination: | 4 - 8 weeks |
| Germination to Transplant: | 4 - 8 weeks |
| Transplanting to Potting: | 6 - 10 weeks |
| Cutting back at Transplanting: | Not Necessary. |
| Container Size(s): | 1-2 plugs per 11/12 cm (4 1/2") / 2-3 plugs per 15 cm (6") |
| 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: | Light (100-150 ppm) |
