Gather the ingredients for your candle. You can use natural ingredients to add a sweet or herbal scent to your candle. This is a good chance to use any left over ingredients from your pantry.
Fill the mason jar about 3/4 with water. Add cinnamon, rosemary, oranges, and about 1 teaspoon of citronella oil or more, depending on how strong you want the citronella scent to be.
Add the tea light candle on top.
Carefully light the candle.
Citronella oil is a natural ingredient to ward off mosquitoes. However, keep in mind that the floating candle alone won't repel all the mosquitoes around you, especially when you are outdoors.