Hi. Hope you are all well. I have a small lemon tree which I bought this year. It has been doing fine and has 3 small lemons on it. It is now in my small green house for the winter. I live in the West of Scotland and we are having some cold frosty nights. Tonight it’s 1degree. Today I went in and wrapped the pot in bubble wrap and then placed in a box filled with the polystyrene nugget things and then tied the box closed. Several leaves fell off but there are some new leaf buds and flower buds appearing, I intend to “nip” these. I put in a paraffin heater but I am not sure if the fumes will be harmful. Am I doing it all wrong? I am new to all things greenhouse