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Hardy sp in unheated greeenhouse


Alexcpdk

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it depends on where you keep them in the greenhouse,   if you keep them on the floor by the open door,where it is cooler and gets the benefit of the cooling draught, they can be grown successfully.   Place them where they get the early morning sun while it is still cool.       if they are in full sun,all day everyday,eventually the heat will kill them.Why not grow them outside?

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50/50 peat and perlite is fine for most species but some do like lime in the mix. I don't think p.primuliflora would survive your winter without any heating.

P.grandiflora will grow well,and there are 4 flower coloured forms

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