RUDBECKIA triloba

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RUDBECKIA triloba

Coneflower, Black-Eyed Susan
Select Item No. RA198

Available

One Portion is usually sufficient for approx. 50 plants.
Please switch to gram for larger quantities.



Plant Description

Life Cycle: Biennial
Family: Asteraceae
Origin: USA: Connecticut south to Florida, west to Michigan, Iowa, Nebraska and Oklahoma
Distinction: Award of Garden Merit (A.G.M.) from the Royal Horticultural Society.
Special Features: A prolific bloomer which readily self-sows like foxgloves. A lovely species, with an airy quality, which easily persists in the garden by reseeding but never becoms weedy. Small 4 cm yellow to orange flowers with brown centers. More open than 'Goldsturm'.
 
Basic Colour: (yellow / gold)
Flower Colour: yellow with brown center
Natural Flowering Period: June - October
 
Winter Hardiness Zones: Z3 - Z8
Foliage: thin upper leaves, lower leaves are rounder and the larger ones are three-lobed
Growth Habit: upright, erect
Height with Flowers: 100 cm
Spacing between Plants: 100 cm
Soil Requirements: dry / well-drained
Location:
Usage: suitable for cutting
Grams per 1000 seeds: 1.05263 Gram
Seeds per Gram
(does not correspond to the number of plants!):
950
Gram to get 1000 plants
(if sown directly into pots etc. you will need a larger quantity):
5 Gram
Sowing Rates/Trays: 4 - 5 per cell
Plug tray recommended size(s): 72 / 128
Sowing Direction:

(8) These perennial seeds germinate very irregularly over a long period. Lower temperatures of less than +5°C [41°F] are very effective. Seed trays should not be discarded prematurely. Constant moisture must be maintained. Do not leave in direct sunlight. For Alstroemeria we recommend to keep sowing for 3 weeks at approximately +30°C [86°F], then 3 weeks at +5°C [41°F], then at +21°C [70°F].

Best Sowing Date
(northern Hemisphere, Field condition):
late autumn - early spring
Sowing to Germination: 4 - 8 weeks
Germination to Transplant: 4 - 8 weeks
Transplanting to Potting: 6 - 10 weeks
Cutting back at Transplanting: Not Necessary.
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: There has been no research, but 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. Some later flowering species can be forced in 14 - 16 weeks and perhaps sooner at warmer temperatures. Further experiments are warranted.
Fertilizer: Medium (150-200 ppm)
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