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The scientific name for the heart leaf fern is Hemionitis arifolia and is commonly referred to by a number of names, including tongue fern. First identified in 1859, heart leaf ferns are native to Southeast Asia. It is a delicate dwarf fern, which is also an epiphyte, meaning it grows upon trees as well.
Because this fern is native to regions of warm temperatures and high humidity, the challenge for the gardener growing heart ferns as houseplants is in maintaining those conditions: low light, high humidity and warm temperatures
Keep the plant moist, but not wet, as it is prone to rot. Ideally, you should use soft water or let hard tap water sit overnight to dissipate the harsh chemicals and then use the next day.
All in all, heart fern is a fairly low maintenance and thoroughly delightful addition to a fern collection or for anyone that wants a unique houseplant.