Yet again need some advice. I just bought a mini greenhouse. Mainly to store pots, and keep young plants in the spring. I don’t have electrical power there. I did place a few plants to over winter, but noticed grey fungus, I assume Botrytis. Sadly I made a mistake, should have got one with vents. I can do some DIY and add vents. In terms of air circulation, I was thinking of solar powered fan, but I don’t get much sunlight there, so could be waste of time. I can keep the door open when I am in the garden but not all the time, several days could pass before I am in the garden. Other issue being, I have ninja squirrels, have a family of them, using the garden as a 5 star resort. They will love rummaging in the greenhouse I am sure, they will be expecting room service next . I may have to get some electrical power to solve the issue. Any thoughts would be welcomed.