POTENTILLA atrosanguinea var. argyrophylla 'Scarlet Starlit'

Himalayan Cinquefoil

Jelitto Perennial Seeds: POTENTILLA atrosanguinea var. argyrophylla 'Scarlet Starlit' - Himalayan Cinquefoil Id-Code: PA 574
Family: Rosaceae
Origin: Species can be found in cool sub-alpine meadows from Afghanistan to southwestern China with primulas and ligularias.
Special Features: Deep scarlet saucers and luxurious grey-green leaves
History: Introduced by JELITTO PERENNIAL SEEDS in 2009. Plant parts have been used traditionally for treatment of colds.
Colour: Deep scarlet
Natural Flowering Period: June - August
Winter Hardiness Zones: Z5-8
Growth Habit: Dense, compact
Foliage: 3 segmented, grey green leaflets with margins precisely toothed
Height with Flowers: 30 cm (12'')
Spacing between Plants: 30 cm (12'')
Soil Requirements: Evenly moist soils, pH 5.5 - 6.8
Location: Full sun or partial shade
Use: Lovely for mixed containers, edging, the rock garden or the front of the border with Alchemilla sericata 'Gold Strike', Aruncus 'Whirlwind' and Ligularia 'Midnight Lady'
Specialities: Outstanding foliage plant

Cultural Tips:
Grams per 1000 Seeds: 0,476
Seeds per Gram: 2100
Seeding Recommendation: 1 g / 1000 plants
Sowing Rate: 2 seeds per cell
Plug tray recommended size(s): 128, 288
Germination: Rapidly germinating, keep seed in constant moisture (not wet) with temperatures of about +20°C [68°F]. Do not cover the seed but tightly press into the earth. 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 - 6 weeks
Transplanting to Salable Plant: 6 - 8 weeks
Cutting-Back at Transplanting: Cut-back once to keep more compact

Growing On:
Container Size(s): 1 plug per 8/9 cm (3 1/2''); 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: 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.
Fertilization: Medium (150-200 ppm)

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