The first plants to suffer from the heat or dry air are those in hanging containers with coconut fiber lining or sphagnum moss. The strawberries shown here, for example, wilted due to dried-out soil during a heat wave. BalconyContainerGardening.com suggests using plastic plant containers in balony gardens more than any other container (i.e. terra cotta containers) because plastic containers are lightweight, cheap and insulate the plant (i.e., lose soil moisture much slower).
Cactus candy is a delicious and unique candy that you can easily make in your kitchen. Odds are that you won’t have enough room in a container garden on your balcony to grow paddle cactus (aka prickly pear or nopal cactus), but you can harvest the cactus’ fruits if you live in the Southwest.