Plan out the positions of marigolds in your garden. For companion planting, the plants must be placed between rows of vegetables, so you should plan for a row of tomatoes and then a row of marigolds on both sides of the tomatoes.
Prune and dry the marigold leaves and stems. Place the dried stems and leaves into some vodka and leave to distill for two weeks. Spray this mixture directly onto your skin or around the garden. Marigold plants will not repel mosquitoes on their own; instead, preparation steps must be taken.
Place fresh leaves and stems into a fire pit and burn the herbs along with the wood. The marigold's oils travel in the smoke and also repel mosquitoes.