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U9020C - RUDBECKIA HIRTA, CONE FLOWER
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'Denver Daisy'
Rudbeckia 'Denver Daisy' was selected for the city-wide beautification on the
occasion of the 150th anniversary of the city of Denver (Colorado) because of its
extreme heat tolerance, its summer-long flower power, and its ability to stand up
under extreme weather variations. Growers will love this new Rudbeckia because of its high germination rates and high percentage of usable seedlings. Low cultural inputs and short crop times ensure that the new 'Denver Daisy' will perform in a wide array of greenhouse situations. Flower power is no understatement for this beauty as large masses of golden flowers adorned with rusty red rings cover the 'Denver Daisy' from late spring until first frost. Strong, dense flower stems (45-50 cm tall) 18-20'' ensure that the 'Denver Daisy' will not flop or fall over in adverse weather conditions.
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TECHNICAL INFORMATION |
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| Life Cycle: | |
Annual
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| Sitelocation: | |
Sun
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| Garden Height: | |
60 cm
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23,62 inch
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| Crop Time: | |
Spring: 14-18 weeks, Summer: 12-14 weeks
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| Seed Form: | |
Coated
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| Seed Count: | |
0 K/g
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| Sowing Method: | |
2-3 seeds per plug, can be sown directly into final pot
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| Germination: | |
Stage I and II: 14-21 days at 20-22 °C 68-72 °F; Stage III and IV: 10-14 days at 18-20 °C 64-68 °F, in media with very low soluble salt levels and pH: 5.8-6.2. Before sowing treat substrate with fungicide. Cover seed lightly with vermiculite after sowing. Keep soil slightly moist but not wet. Avoid direct sunlight by shading seeds after sowing
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| Growing On: | |
5-6 weeks after sowing transplant 1-3 plants into a pot, 10-17 cm 6'', or into a container (3-5 l). Plant cut flowers (frost free) in 25-30 x 30-35 cm space.
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| Media: | |
Use a well-drained, growing substrate with 20-30 % clay, 1-1.5 kg/m³ complete balanced fertilizer, 0-2 kg/m³ slow release fertilizer (3-6 months), ironchelate,
micronutrients, pH: 5.8-6.2. Field: loamy sandy to sandy humus soils with good drainage and good nutrition levels. Standard fertilization: 80-100 g/m² of a slow
release fertilizer.
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| Photoperiod / Light: | |
Long day plant. For flower initiation long day (14-16 h) is required.
Keep light level high, because high light levels improve the plant quality and the stems
elongation. In winter and in early spring additional assimilation light is required for pot
plant and cut flower production. Night interruption is possible. A short day period can
be used to control the plant growth. 2-5 weeks after transplantation cultivate at short
day (10 h) conditions for 7-10 days for a compact plant growth. Afterwards return to
long day conditions (14-16 h) again.
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| Temperature: | |
Grow at 18-20 °C 64-68 °F. R. hirta needs warm temperatures for the growth. Temperatures of 16 °C 61 °F increase the cultivation time by 3 weeks. Temperatures below 16 °C 61 °F can be a cause for red colouring of leaves. R. hirta does not tolerate frost.
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| Fertilization: | |
Moderate fertilization levels are required. Fertilize the crop weekly with 100-150 ppm nitrogen (at 0 kg/m³ slow release fertilizer in substrate), using a potassium balanced fertilizer (N: K2O-ratio: 1:1.5). Avoid high ammonium and high nitrogen levels. Prevent magnesium deficiency by applying magnesium sulphate (0,05 %) 1-2 times and in case of iron deficiency (above pH 6.0) apply iron-chelate for 1-2 times. Field: Take care of possible iron deficiency and apply iron-chelate for 1-2 times. N min soil value: approximately 130 g N/m².
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| Cultural Hints: | |
Keep humidity low and provide good ventilation. Avoid over watering and drought stress. Drought stress can be a cause for necrosis of leaves edges. Avoid
over head irrigation and avoid late day watering to reduce the risk of Botrytis
especially at cooler growing conditions.
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* Germination Stages (from seed to finished young plant)
| Stage I: | Starts with the radicle breaking through the testa. The roots are touching the medium. Ends with fully developed cotyledons. |
| Stage II: | Starts from fully developed cotyledons. Ends with the fully developed true leaf or true leaf pair. |
| Stage III: | Starts from the fully developed true leaf or true leaf pair and ends with 80% of the young plants being marketable. |
| Stage IV: | All young plants are ready for sale and in the process of being hardened off. This stage lasts about 7 days. |
Hint
The cultural recommendations are based on results from trials conducted under Central European conditions. Different conditions in other parts of the world may lead to deviations in results achieved.
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