Creating a mosquito-free balcony garden can be achieved by incorporating certain plants known for their repellent properties. Citronella grass is a popular choice, emitting a lemony scent that masks the odors mosquitoes use to locate targets. Lemongrass is similar, providing culinary benefits along with its insect-repelling qualities. Lavender not only adds beauty with its purple blooms but also disrupts mosquitoes' sense of smell. Marigolds are vibrant flowers that contain pyrethrum, commonly found in organic insecticides. Rosemary and basil serve dual purposes, offering culinary uses while naturally deterring mosquitoes. Peppermint is effective due to its menthol content, while scented geraniums provide low-maintenance protection. Lastly, garlic can create an environment that mosquitoes find uninviting. By adding these plants to your balcony, you can enjoy a beautiful space free from buzzing pests.