Yarrow, Milfoil
Id-Code: AA 022
Family: Asteraceae, Compositae
Origin: Balkans
Special Features: A shorter version of Achillea filipendulina
History: Used in hybrid crosses with the taller Achillea filipendulina
Colour: Flat heads of bright yellow
Natural Flowering Period: June - August
Winter Hardiness Zones: Z4-8
Growth Habit: Clumping
Foliage: Grey-green, pinnate-shaped
Height with Flower: 50 cm (20'')
Spacing between Plants: 50 cm (20'')
Soil Requirement: Well-drained soils, pH 5.8 - 6.8
Location: Full sun
Use: Suitable for the rock garden or the front of the border with Coreopsis 'Sterntaler', Eryngium 'Blaukappe' and Platycodon 'Hakone White'
Specialities: Outstanding fresh, or dried, cut flowers
Cultural Tips:
Grams per 1000 seeds: 0,222
Seeds per Gram: 4500
Seeding Recommendation: 1g / 1000 plants
Sowing Rate: 4-5 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 seeds but tightly press into the earth. Keep in cooler conditions after germination occurs.
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 (4 1/2''); 2-3 plugs per 15 cm (6'')
Vernalization: Some flowering will occur the first year without vernalization, but improved flowering will occur the 2nd year; and 3-10 weeks of cool temperatures might benefit fuller flowering in the first year.
Forcing: 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. 6-8 weeks to flower.
Fertilization: Medium (150-200 ppm)
