It's wonderful to have a pond and bog garden to attract dragon flies as they are beautiful to watch and they eat mosquitoes. The pond needs to be at least 50 cm deep and would need some tall plants that they will use as a perch. The bog garden would need a damp, muddy area where the females will lay their eggs. They are sensitive to air pollution and poisons, so don't use insecticides. Make sure that you have a bench nearby so that you can sit and watch these beautiful creatures.