Signs of under-watering your air plant include the leaf tips turning brown or crispy. The natural concave shape of air plant leaves tends to become more exaggerated when under-watered.   Unfortunately, if your air plant has been over-watered, it’s often too late to save it. If the base of the plant turns brown or black, and leaves are falling out or off from the center, your plant has likely succumbed to rot.   Air plants are pretty easygoing when it comes to their temperature. They do best between 50-90 degrees F. Ideally, overnight temperatures will be about 10 degrees cooler than daytime temperature.   Incorporating orchid or Bromeliad fertilizer into your watering regimen once or twice a month is a great way to keep your air plant happy. Just add a pinch to your water and proceed as usual. Fertilizing your air plant encourages it to blossom and reproduce (or pup — more on this later)