RUDBECKIA grandiflora 'Sundance'

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RUDBECKIA grandiflora 'Sundance'

Rough Coneflower, Tall Coneflower, Black-Eyed Susan
Select Item No. RA156

Available

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



Plant Description

Life Cycle: Perennial
Family: Asteraceae
Origin: Native to a few scattered locations in the Southeastern, Midwest and Central USA
Special Features: Lovely golden-yellow blooms shaped like parasols with tall brown cones. Elegant upright and sturdy habit, healthy foliage. Jelitto's select strain of an uncommon Black-Eyed Susan. Terrific cut flower candidate.
Historical: Introduced by JELITTO PERENNIAL SEEDS in 2008.
 
Basic Colour: (yellow / gold)
Flower Colour: golden-yellow
Natural Flowering Period: August - October
Flowering: First year flowering
 
Winter Hardiness Zones: Z4 - Z8
Foliage: oblong, intensive green
Growth Habit: erect / sturdy
Height with Flowers: 120 cm
Spacing between Plants: 75 cm
Soil Requirements: dry / well-drained
Location:
Characteristics: solitary plant
Usage: suitable for cutting
Grams per 1000 seeds: 1.29032 Gram
Seeds per Gram
(does not correspond to the number of plants!):
775
Gram to get 1000 plants
(if sown directly into pots etc. you will need a larger quantity):
4 Gram
Sowing Rates/Trays: 2 - 3 per cell
Plug tray recommended size(s): 72 / 128
Sowing Direction:

(15) Rapidly germinating, keep seed in constant moisture (not wet) with temperatures of about +20°C [68°F]. Seeds must be covered thinly. Do not cover very small seeds, but tightly press into the earth. Keep in cooler conditions after germination occurs.

Best Sowing Date
(northern Hemisphere, Field condition):
Anytime
Sowing to Germination: 2 - 3 weeks
Germination to Transplant: 4 - 6 weeks
Transplanting to Potting: 6 - 8 weeks
Cutting back at Transplanting: Cut-back once to keep more compact.
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: High (200-250 ppm)
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