Ann, you can usually use any menthol based plants, also. The melaleuca plant (Australian Tea tree) is excellent for this.
I use lavender oil, which is nice and smelly:) For sitting at a table or otherwise outside, you can burn dried Bay Leaves. They work well, I find. It you have some dried orange or lemon peel toss that in also! The oils in both appear to work well as deterrents.
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