Hypericum Grandiflorum

TECHNICAL INFORMATION

Life Cycle:Perennial

Familiy, Origin:Clusiaceae, Sout-East-Europe, Asia Minor

Sitelocation:Full sun - partial shade

Garden Height:25 cm， 9,84 inch

Natural flowertime:June - August

Crop Time:Plug crop: 8 weeks; Green pots: 7-8 weeks; Flowering pots: 9-12 weeks, annual production is possible; Flowering pots: 9-10 months, including wintering

Sell Period:April-October

Seed Form:Raw Seed

Seed Count:3333 K/g

Sowing Method:1-3 seeds per plug, can be directly sown in final pot

Germination:14-28 days at 18-22 °C, in media with low soluble salt levels and pH: 5.5-7.5. 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.

Plug Culture:From Stage II* reduce the soil moisture, but the plug should not dry out and reduce the temperature to 15-18 °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 up to 100-130 ppm.

Growing On:6-8 weeks after sowing transplant 1-3 plants into a pack or pot (8-15 cm).

Media:Use a well-drained, growing perennial substrate with 0-15 % clay, 0-20 % parts (e.g. wood fibres, bark, sand) 1-1,5 kg/m3 complete balanced fertilizer, 0-2 kg/m3 slow release fertilizer (3-9 months), iron-chelate, micronutrients, pH: 5.5-7.5.

Photoperiod / Light:Long day plant. Keep long day (12-14 h) for flower initiation and vegetative growth. Flowering pot production in winter and early spring with additional assimilation light is recommended.

Temperature:Grow at 10-15 °C or outdoors. In winter indoors frost free at 3-5 °C or outdoors. Outdoor fleece needed. For wintering the root development in pots should be very good. In early spring (from cw 51 earliest) the plants start to grow indoors for 9-11 weeks at 8-12 °C.

Fertilization:Low-moderate fertilization levels are required. Fertilize the crop weekly with 80-100 ppm nitrogen (at 2 kg/m3 slow release fertilizer in substrate), using a complete balanced fertilizer. Avoid high ammonium and high nitrogen levels. High nitrogen levels are the cause that shoots are stretched and the plants fall apart. Don't fertilize after mid September. In spring fertilize with 80-100 ppm nitrogen, using 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.

Cultural Hints:Avoid that the plant roots grow into the soil underground and cultivate as cool as possible for compact plant development. Cut the plant tops after transplanting for a better branching, but do not remove the top plant in spring, because for the flower initiation a chilling period (vernalization) is necessary.