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Punasinine rusuvars Lithospermum purpureo-caeruleum
Lithospermum purpureo-caeruleum
Creeping, groundcovers;
VI, Z4-8, 30 cm;
gentian blue, excellent groundcover.
Family: Boraginaceae
Origin: Europe
Special Features: Strong-growing ground cover with flowers which turn to gentian-blue; the seeds are very hardy
Distinction: Plant of the Year 2000 in Germany
Colour: Flowers open red-purple before turning to gentian-blue
Natural Flowering Period: June
Winter Hardiness Zones: Z4-8
Growth Habit: Procumbent mounds which spread by stolons
Foliage: Glossy and hairy, narrow, elliptical or lanceolate leaves
Height with Flower: 30 cm
Spacing between Plants: 30 cm
Soil Requirement: Well-drained soils which are slightly more alkaline; pH 5.8 - 7.2
Location: Full sun to partial shade
Use: Plant at the edge of woods in large colonies together with Baptisia australis var. minor, Euphorbia amygdaloides and Geranium sanguineum
Specialities: Excellent naturalizing, drought-tolerant ground cover. On the list of endangered plants in Germany.
VI, Z4-8, 30 cm;
gentian blue, excellent groundcover.
Family: Boraginaceae
Origin: Europe
Special Features: Strong-growing ground cover with flowers which turn to gentian-blue; the seeds are very hardy
Distinction: Plant of the Year 2000 in Germany
Colour: Flowers open red-purple before turning to gentian-blue
Natural Flowering Period: June
Winter Hardiness Zones: Z4-8
Growth Habit: Procumbent mounds which spread by stolons
Foliage: Glossy and hairy, narrow, elliptical or lanceolate leaves
Height with Flower: 30 cm
Spacing between Plants: 30 cm
Soil Requirement: Well-drained soils which are slightly more alkaline; pH 5.8 - 7.2
Location: Full sun to partial shade
Use: Plant at the edge of woods in large colonies together with Baptisia australis var. minor, Euphorbia amygdaloides and Geranium sanguineum
Specialities: Excellent naturalizing, drought-tolerant ground cover. On the list of endangered plants in Germany.
Cultural Tips:
Grams per 1000 seeds: 14,286
Seeds per Gram: 70
Seeding Recommendation: 20 g / 1000 plants
Sowing Rate: 2-3 seeds per cell
Plug tray recommended size(s): open flats
Germination: The sowing must be kept warm (about +18 to 22°C) 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) for another 4-6 weeks. It is not so important if the temperature is higher of lower during the cooling period, but the cooling period has to be prolonged because the synthesis of the germination inducer, homonlike acid, slows down or comes to a standstill.
It is beneficial to cover the sowing with snow during the cooling period. After this cooling period the sowing may not be immediately exposed to high temperatures. The most effective temperatures are between +5 to 12°C, even if germination has started. The best location for this sowing, even in March, April and May, is open field, the cold frame or a cold greenhouse.
Scheduling:
Best Sowing Dates: November - March
Sowing to Germination: 8 - 10 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 plug per 8/9 cm; 1-2 plugs per 11/12 cm
Vernalization: A prudent recommendation would be to provide 6-12 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).
Bot. syn.: Buglossoides purpurocaerulea (L.), Aegonychon purpureocaeruleum (L.) Holub, Buglossoides purpureocaeruleum (L.) I.M.Johnst.
