ERYSIMUM helveticum

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ERYSIMUM helveticum

Swiss Wallflower
Select Item No. EA180

Available

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



Plant Description

Life Cycle: Perennial
Family: Brassicaceae
Origin: Central and Eastern Europe
Special Features: Compact plants featuring fragrant flowers. Sulphur-yellow flower heads opening from purple buds.
 
Basic Colour: (yellow / gold)
Flower Colour: sulphur yellow
Natural Flowering Period: June - August
 
Winter Hardiness Zones: Z4 - Z8
Foliage: linear, deep green
Growth Habit: clumping
Height with Flowers: 25 cm
Spacing between Plants: 25 cm
Soil Requirements: dry / well-drained
Location:
Usage: for the rock garden
Grams per 1000 seeds: 0.83333 Gram
Seeds per Gram
(does not correspond to the number of plants!):
1200
Gram to get 1000 plants
(if sown directly into pots etc. you will need a larger quantity):
2 Gram
Sowing Rates/Trays: 2 per cell
Plug tray recommended size(s): 128 / 288
Sowing Direction:

(16) See 15 with the exception of germination being slower and more irregular. This poses no problems.

(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):
Anytime
Sowing to Germination: 2 - 3 weeks
Germination to Transplant: 4 - 6 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")
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: This species is not a suitable candidate for forcing.
Fertilizer: Light (100-150 ppm)
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