Greenhouse idea for cold area

[RosieC]

I think for phals and most Dens you would need to heat quite a lot in the winter. Phals like house temps , even a cool house can be too low for them to do well.

Ones can go cooler but generally need at least 12C. It could cost a lot in heating unless you insulate really well. If you are on a budget it might ne hard for those sorts (that's why I only do cool plants outside in the winter, the rest come in the house for the winter and the phals are always in the house.)