Tropical Indoor palm trees are among their most popular containerized plants to use in business offices, solarium use and indoor shopping malls, chiefly, because the prices are so reasonable and the light and watering requirements are low. The placement of plants indoors humidifies and purifies the air by photosynthesis that converts carbon dioxide into oxygen, a gas that supports life. The indoor tropical palms also have been tested for many years to offer a palm selection that is adapted inside.