I understand the problems with the grow camellias in Europe. Perhaps some tips from me. Camellias would an acidic soil substrate, because there are almost moor(bog)bed-plants.So is lime-free water to the pour to use (rainwater).
The preparation for the winter is important.From about August is fertilized until may no longer and less will be poured into the autumn.So, the shoots mature right up to the end of the year.
Camellias need a cold period and should therefore should not too warm are but below 12 ° C in the winter quarter frost-free, (the perfect resting phase is 0 to 10 ° C), otherwise no flower buds are trained.
Camellias can overwinter quite 6 weeks, to two months in the cool basement (similar, such as Oleander).But it is important that the Camellia plants in the basement get too dry air.A cool, frost free greenhouse, where the corresponding humidity is guaranteed would be optimal.
The be-all and end-all of proper wintering is in addition to the temperature, a proper humidity.And that is relatively high: over 60%.If the hibernation in the winter garden doesn't work out and the plants drop their buds, then it could be too dry.Newly purchased camellias can have gotten too much heat and dryness in the Salesrooms.When watering, make sure, that the growing pot not staying in cover pots full of water.
In January/February the Camellia may be set not to quickly warm. Now need plenty of light! For the blooming time, a temperature of 6 to 12 ° C is sufficient at night - the plants stand still so cool. Best luck and a nice weekend
, ThaiGer.