Air plants are fun because they can be displayed in a variety of containers to suit any style. The formal lines of geometric planters contrast especially nicely with the curved lines of air plants' unusual foliage. Also called tillandsia, air plants aren't limited to a single season. They grow all year long and are virtually impossible to kill. Just give them a good soaking once or twice a week, depending on your climate, and they'll look healthy and beautiful in your geometric container.