PENSTEMON virgatus 'Blue Buckle'

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PENSTEMON virgatus 'Blue Buckle'

Stiff Beard-Tongue, Wand Bloom
(deaveri)
Select Item No. PA254

Available

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



Plant Description

Life Cycle: Perennial
Family: Scrophulariaceae
Origin: Western North America
Special Features: Numerous PENSTEMON species are notoriously difficult to grow outside of their natural habitat. But this is not the case for PENSTEMON virgatus (deaveri). Rich-flowering select strain with large flowers arranged in dense clusters on rigid, upright stems. It can withstand heat and drought without falling out of rank and is cold hardy and tough-natured, too.
Historical: Introduced by JELITTO PERENNIAL SEED in 2002.
 
Basic Colour: (blue)
Flower Colour: blue-purple
Natural Flowering Period: July - September
 
Winter Hardiness Zones: Z5 - Z8
Foliage: narrow, glossy, dark-green, narrow
Growth Habit: erect
Height with Flowers: 30 cm
Spacing between Plants: 40 cm
Soil Requirements: dry / well-drained
Location:
Usage: for the rock garden
Grams per 1000 seeds: 0.55556 Gram
Seeds per Gram
(does not correspond to the number of plants!):
1800
Gram to get 1000 plants
(if sown directly into pots etc. you will need a larger quantity):
3 Gram
Sowing Rates/Trays: 6 per cell
Plug tray recommended size(s): 128 / 288
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):
Anytime
Sowing to Germination: 2 - 3 weeks
Germination to Transplant: 4 - 8 weeks
Transplanting to Potting: 6 - 10 weeks
Cutting back at Transplanting: Cut-back once to keep more compact.
Container Size(s): 1-2 plugs per 11/12 cm (4 1/2")
Vernalization: There is no current research on vernalization but a prudent recommendation for any perennial would be 6-12 weeks (a few might need 15 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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