First polytunnel winter ....

[leicestershirelass]

...... should we be leaving the door open for ventilation? Not much growing in there at the moment, but would hate to somehow contaminate the soil / environment.

[Alison]

The doors and windows of my greenhouse are very much closed on a day to day basis at the moment but I do open them when it's sunny for a few hours to make sure that it doesn't become airless in there.

[Two_Sheds]

I open my greenhouse only if it's all steamed up inside

[leicestershirelass]

Hi - thanks for advice ... was a bit bothered in case the air / soil became stale with being shut up during cold spell

[Digger Don]

We have mesh over the holes at each end of our polytunnel, which we leave uncovered at this time of year in order to keep the tunnel fresh.
We only have winter cabbage and some sleeping strawberries in at the moment and keeping the tunnel closed will not affect the lower temperatures much; not only that, freezing clear skies would allow the temperature to skyrocket during a sunny day only to freeze again at night. A plants idea of hell

[plantsbypost.com]

Keeping closed up all winter will increase the chances of botrytis and mildew getting hold, open it up every now and then to get the air circulation. If theres nothing in it and there is no wind forecast, it may as well stay open.

Neil

[leicestershirelass]

Thanks for advice Ron and Neil ... will keep doors open when no wind (blowing a gale at the mo!)