PRIMULA japonica 'Alba'
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|Distinction:||Award of Garden Merit (A.G.M.) from the Royal Horticultural Society.|
|Basic Colour:||(white / cream)|
|Natural Flowering Period:||May - July|
|Winter Hardiness Zones:||Z4 - Z8|
|Growth Habit:||erect / clumping|
|Height with Flowers:||50 cm|
|Soil Requirements:||moist / boggy / along streamsides / well-drained / humus rich, fertile|
|Usage:||water or marshplant|
|Grams per 1000 seeds:||0.22222 Gram|
|Seeds per Gram
(does not correspond to the number of plants!):
|Gram to get 1000 plants
(if sown directly into pots etc. you will need a larger quantity):
(1) Cold-germinators are still referred to as frost-germinators, although this isn’t quite correct. The sowing must be kept warm (about +18 to +22°C) [about 64 to 72°F] and moist for the first 2–4 weeks. After this period the sowing must be kept at a cold temperature (between –4 and +4°C) [between 25 and 39°F] for another 4–6 weeks. Colder temperatures of –5°C [23°F] are only advantageous for most species of the Ranunculus family. It is not so important if the temperature is higher or lower during the cooling period, but the cooling period has to be prolonged because the synthesis of the germination inducer, hormon-like acid, slows down or comes to a standstill.