If you display your plants in a container, always remove it before watering. Terrariums, bowls, etc... will hold moisture which will make your plant rot, usually this starts at the base. If you have plans to permanently secure your plant to any type of object (driftwood, etc...) make sure you choose a material that can be immersed with the plant and will also dry completely. If you live in warmer regions and/or areas where humidity is fairly low, you may need to water your plants more often. Maybe two or three times weekly. You can use a spray bottle and mist the plants every few days in between your normal waterings. But, immersing the plants is the preferred method and will yield the best results.
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Air plants are actually called Tillandsias, which happens to be part of the Bromeliaceae or Bromeliad species. They have also been labelled as Epiphytes, as they do not need to have soil to grow. The air plant is often found in the jungles, mountain tops, and deserts, of Central and South America, and Mexico and the the southern United States in North America.