|
|
|
U3910 - PRIMULA DENTICULATA, DRUMSTICK PRIMROSE
|
|
'Mixed Shades'
Large globular flower heads in a variety of colours.
|
|
|
|
|
|
|
TECHNICAL INFORMATION |
|
| Life Cycle: | |
Perennial
|
|
| Familiy, Origin: | |
Primulaceae, Afghanistan to China
|
|
| Sitelocation: | |
Partial shade - shade
|
|
| Garden Height: | |
30 cm
|
|
| | |
11,81 inch
|
|
| Natural flowertime: | |
April - May
|
|
| Crop Time: | |
Plug crop: 9 weeks; Green pots: 18-20 weeks; Flowering pots: 8-10 months, including vernalisation
|
|
| Sell Period: | |
December-March
|
|
| Seed Form: | |
Raw Seed
|
|
| Seed Count: | |
16667 K/g
|
|
| Sowing Time: | |
Mid April- Mid Mai for flowering in pots following year
|
|
| Sowing Method: | |
1-3 seeds per plug
|
|
| Germination: | |
10-15 days at 15-20 °C, in media with very low soluble salt levels and pH: 5.5-6.0. Cover seed lightly with vermiculite after sowing. Keep soil wet (relative humidity: 100 %). Avoid direct sunlight by shading seed after sowing.
|
|
| Plug Culture: | |
From Stage II* reduce the soil moisture, but the plug should not dry out. Do not let soluble salt level rise above 0,50 EC. Start fertilization at 50 ppm nitrogen in a well balanced formula. During Stage III and Stage IV fertilization levels can be increased to 150 ppm.
|
|
| Growing On: | |
4-6 weeks after sowing transplant 1-3 plants per plug tray (4x4 cm) or in packs. The first true leaf should be full developed. 6-8 weeks later transplant 1-3 plants into a pot (9-12 cm) or 3-6 plants into a container (3-5 l). Two time transplantation supports root development and young plant quality. Transplant the plant not too deep into pot.
|
|
| Media: | |
Use a well-drained, growing substrate with 15-30 % clay, 0-15 % parts (e.g. bark, perlite), 0,5-1,5 kg/m³ complete balanced fertilizer, 0-3 kg/m³ slow release fertilizer (3-6 months), iron-chelate, micronutrients, pH: 5.5-6.0.
|
|
| Photoperiod / Light: | |
Day length neutral plants. At short day condition the flower initiation is at temperatures of 8-10 °C (late summer-autumn), while the foliage formation is at long day conditions. The critical day length is 12 h. In winter and in early spring supplemental lighting (3000-4000 lx) is recommended. Protect the plants in summer against high sunlight.
|
|
| Temperature: | |
Grow at 13-15 °C or outdoors. In winter indoors frost free at 3-5 °C or outdoors. Outdoor fleece cover needed. At mid December the plants start to grow for 6-8 weeks at 8-10 °C or for 4-6 weeks at 20 °C during daytime and at 5 °C during night (quick flowering). A chilling period (vernalization) is required, but the chilling period can be replaced by a GA3-treatment.
|
|
| Fertilization: | |
Moderate fertilization levels are required. Fertilize the crop weekly with 150-200 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, because this can cause the foliage to get too big. Don't fertilize after early October. In spring fertilize 150-200 ppm nitrogen of a potassium balanced fertilizer (N: K2O-ratio: 1:1,5). Prevent magnesium deficiency by applying magnesium sulphate (0,025 %) 1-2 times and in case of iron deficiency apply iron-chelate for 1-2 times. Treat nitrogen deficiency (yellow foliage) with urea foliage fertilization. The roots are sensitive to high salt levels (above 2 g/l) in substrates. Avoid high fertilizer concentrations, it is advisable to fertilize several times with low concentrations weekly.
|
|
| Cultural Hints: | |
Avoid a too dry substrate or a too low humidity, because this can be a cause for yellow leaves. Remove the yellow foliage in time in autumn/winter in order to decrease the risk of fungi infection.
|
|
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.
|
|
|
