Polemonium boreale L.
Brand: Jelitto
Packaged:0,2 g
Availability:In Stock
Ex Tax: 1.75€
Northern Jacobs-ladder "Heavenly Habit" (Greek Valerian, Charity) - Polemonium boreale.
Hardy Perennial. Flowers: Summer. Height: 12 inches.
Ideal For: Border, Containers, Patio, Tubs.
Germination: Easy.
Aftercare: Easy.
Attractive clusters of violet-blue flowers, each with a distinct golden yellow eye, look divine against the bushy, deep green foliage. Their dwarf habit makes them an idea! in the front of borders, or even containers. If deadheads are removed regularly, plants will continue to flower throughout the summer.
Family: Polemoniaceae.
Origin: Northern Hemisphere.
Special Features: Compact growing habit, glossy leaves and larger flowers.
Colour: Erect panicles hold larger blue flowers, each with a centre consisting of a yellow eye with a white centre.
Natural Flowering Period: June - August.
Winter Hardiness Zones: Z3-8.
Growth Habit: Clumping.
Foliage: stems, somearial, helvetica bi-pinnate, with up to 20 oval to oblong, glossy leaflets.
Height with Flower: 30 cm. Spacing between Plants: 45 cm.
Soil Requirement: well-drained soils, pH 5.8 - 6.8.
Location: partial shade.
Use: plant together with Platycodon "Hakone White", Veronica longifolia "Pink Shades" and Tanacetum "Jackpot".
Specialities: outstanding combination of flowers and foliage; Easy-to-grow from seed.
1,0 g = 660 seeds.
Seeding Recommendation: 3 g / 1000 plants.
Sowing Rate: 2-3 seeds per cell. Plug tray recommended size(s): 128 or 288.
Germination: rapidly germinating, keep seed in constant moisture (not wet) with temperatures of about +20°C. The seed must be covered thinly. Keep in cooler conditions after germination occurs. The germination might be slower and more irregular. This poses no problems.
Best Sowing Dates: anytime. Sowing to Germination: 2 - 3 weeks. Germination to Transplant: 4 - 8 weeks. Transplanting to Salable Plant: 6 - 10 weeks.
Cutting-Back at Transplanting: Not Necessary.
Growing On: Container Size(s): 1-2 plugs per 11/12 cm.
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 5°C. Exposure to cold may not be necessary for flowering but might improve quality.
Forcing: An obvious place to experiment - following vernalization - would be raising daytime temperatures to 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.

Eng.: Boreal Jacobs-ladder, Northern Jacobs-ladder, Greek Valerian, Charity. Bot. syn.: Polemonium richardsonii Graham.

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