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S9210 - PENSTEMON BARBATUS, BEARD-TONGUE, BEARDED PENSTEMON
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'Rondo'
Colorful rock garden delight, red and blue shades, hyacinth-type flower, clump-forming perennial, wintergreen.
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TECHNICAL INFORMATION |
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| Life Cycle: | |
Perennial / first year flowering
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| Familiy, Origin: | |
Scrophulariaceae, North America
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| Sitelocation: | |
Full sun - partial shade
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| Garden Height: | |
40 cm
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15,75 inch
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| Natural flowertime: | |
June - September
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| Crop Time: | |
Plug crop: 5 weeks; Green pots: 6-8 weeks; Flowering pots: 14 weeks, annual production is possible; Flowering pots: 10-12 months, including wintering
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| Sell Period: | |
May-September
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| Seed Form: | |
Raw Seed
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| Seed Count: | |
1099 K/g
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| Sowing Time: | |
January-March for flowering in pots from July onwards; June-August for flowering in pots the following year
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| Sowing Method: | |
1-3 seeds per plug, can be sown directly in pots
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| Germination: | |
14-21 days at 18-22 °C, in media with very low soluble salt levels and pH: 5.5-7.0. Requires light for germination. 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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| Plug Culture: | |
From Stage II* reduce the soil moisture, but the plug should not dry out and reduce the temperature to 16-18 °C. Do not let soluble salt level rise above 0,75 EC. Start fertilization at 50-75 ppm nitrogen in a well balanced formula. During Stage III and Stage IV fertilization levels can be increased to 150 ppm.
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| Growing On: | |
3-4 weeks after sowing transplant 1 plant into a packs or pot (8-15 cm) and 1-2 plants into a container (3-5 l). For flowering pot production ensure good pot size, to encourage root growth, thus improving plant quality.
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| Media: | |
Use a well-drained, growing substrate with 15-30 % clay, 0-20 % parts (e.g. bark, perlite, sand), 1,5-3 kg/m³ complete balanced fertilizer, 0-3 kg/m³ slow release fertilizer (3-9 months), iron-chelate, micronutrients, pH: 5.5-7.0.
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| Photoperiod / Light: | |
Day length neutral plant. Keep light level high, because high light intensity and long day (16-18 h) improve the flowering and the pigmentation of the flowers and the leaves is more intense than at low light intensity. In winter and in early spring supplemental lighting (at least 10 Watt/m²) is recommended. Light deficiency supports excessive stretching of the shoots.
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| Temperature: | |
Grow at 12-18 °C during day time and at 10-13 °C during night or outdoors. In winter indoors frost free at 3-5 °C or outdoors. Outdoor fleece cover or high mulch cover (e.g. straw) needed. In spring the plants start to grow for 11-12 weeks at 15-18 °C. Cold temperatures at 8-13 °C will increase the cultivation time. A chilling period (vernalization) for flower initiation is not required. P. barbatus can also made to flower earlier in the polytunnel.
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| Fertilization: | |
High fertilization levels are required. Fertilize the crop weekly with 100-150 ppm nitrogen (at 3 kg/m³ slow release fertilizer in substrate), using a complete balanced fertilizer. Avoid high ammonium and high nitrogen levels. Don't fertilize after mid September. In spring fertilize 100-150 ppm nitrogen of a potassium balanced fertilizer (N: K2O-ratio: 1:1,5). 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.
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| Cultural Hints: | |
Cultivate in growth period with constant water supply, because the roots are very sensitive to very wet or very dry substrates. In winter cultivate the plants rather dry. Treat pots with a fungicide against Botrytis after transplanting, for wintering and in spring. Remove regularly the faded flowers to support the following flowering.
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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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