What would be growing on it?
Any kind of sun shade? Split cane matting?
You'd be surprised at how much lift a load of foliage can generate on a windy day
In part of my job I deal with outdoor events and it's common for people to post on a forum when an outdoor stage put up by amateurs turns into a sail and topples over. You'll need quite big pots full of concrete to ensure it stays in place
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