Just a couple pics of how i treat some of my large community pots for the winter.
I am an upholsterer for a living so I am lucky to have access to sunbrella fabrics.
These fabrics are very good for outdoor applications, some of them are awning grade and should last for many years.
I use a powder fungicide that can be mixed with water and spray plants and media
very well at 1/2 manufacturers suggested rate per gal.
then check once a month for any unusual growth .
I also keep these pots on the north side of my house so no sun at all .
And i lightly mulch my fly traps with pine bark mulch.