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Bigelowi heleenium "Tip Top" Helenium bigelovii
Helenium bigelovii
Family: Asteraceae, Compositae.
Origin: Oregon and California/USA.
Special Features: Bright yellow blossoms with a distinctive black-brown cone. A shorter and more compact habit than many Helenium varieties, early flowering.
History: Introduced by Jelitto in 2005.
Colour: Deep yellow with prominent black-brown cone.
Natural Flowering Period: June - August.
Winter Hardiness Zones: Z4-8.
Growth Habit.
Upright Foliage: Medium-green lance-shaped leaves.
Height with Flower: 60 cm.
Spacing between Plants: 60 cm.
Soil Requirement: Well-drained soils with 5.8 - 7.2 pH.
Location: Full sun.
Use: Plant in the border with Echinacea "Magnus Superior", Heuchera villosa var. macrorrhizza, Stokesia laevis and Stipa tenuissima.
Specialities: Good cut flower candidate. Easy-to-grow
Cultural Tips:
Grams per 1000 seeds: 0,60.
Seeds per Gram: 1650.
Seeding Recommendation: 2 g / 1000 plants.
Sowing Rate: 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. Seeds must be covered thinly. Keep in cooler conditions after germination occurs. The germination might be slower and more irregular. This poses no problems.
Scheduling.
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: Cut back 1-2 times; once at transplanting; once again 4 weeks later to keep more compact.
Growing On: Container Size(s): 1-2 plugs per 11/12 cm; 2-3 plugs per 15 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.
Fertilization: Medium (150-200 ppm).
Origin: Oregon and California/USA.
Special Features: Bright yellow blossoms with a distinctive black-brown cone. A shorter and more compact habit than many Helenium varieties, early flowering.
History: Introduced by Jelitto in 2005.
Colour: Deep yellow with prominent black-brown cone.
Natural Flowering Period: June - August.
Winter Hardiness Zones: Z4-8.
Growth Habit.
Upright Foliage: Medium-green lance-shaped leaves.
Height with Flower: 60 cm.
Spacing between Plants: 60 cm.
Soil Requirement: Well-drained soils with 5.8 - 7.2 pH.
Location: Full sun.
Use: Plant in the border with Echinacea "Magnus Superior", Heuchera villosa var. macrorrhizza, Stokesia laevis and Stipa tenuissima.
Specialities: Good cut flower candidate. Easy-to-grow
Cultural Tips:
Grams per 1000 seeds: 0,60.
Seeds per Gram: 1650.
Seeding Recommendation: 2 g / 1000 plants.
Sowing Rate: 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. Seeds must be covered thinly. Keep in cooler conditions after germination occurs. The germination might be slower and more irregular. This poses no problems.
Scheduling.
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: Cut back 1-2 times; once at transplanting; once again 4 weeks later to keep more compact.
Growing On: Container Size(s): 1-2 plugs per 11/12 cm; 2-3 plugs per 15 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.
Fertilization: Medium (150-200 ppm).
Eng.: Bigelow's sneezeweed. Suom.: Syyshohdekukka. Sven.: Solbrud.
