On lemon tree in garden for the summer
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It is likely to damage your plant.
I have found that placing plants outside on a very windy wet night in winter when it is 4-6 deg C removes them as citrus turns the backs of the leaves to the wind in order to get them knocked off by fast moving rain drops. You may need to chain the pot down though. I tried growing them from seed from bought fruit.
It is unlikely they will be able to get shelter before you have taken the plant in again and it has turned cold again.
Thanks for that! The plant has been brought back from the brink! It was a tiny stick nursed back to health by to my Gran. It bore several lemons this year. Mum and I used to remove the scale insects as Gran (at 96) couldn't see them. She died in the summer and Mum 'inherited' the plant (and the scale insects!) We removed loads today - they occur all over the plant.
Lat/Lng: 50.8036, -0.4665
OS grid ref: TQ081015