Plants with this tag need a higher level of humidity than your average home provides on its own. You will need to augment with a humidifier and/or frequent spritzing/misting. Be sure to use lukewarm water when you spritz your plants and keep these plants far away from heat vents or AC units. Keeping a hygrometer nearby is a great way to keep track. Plants in this category will suffer greatly without high humidity, so this isn't a factor you want to ignore.