The heart fern comes from the Pteridaceae family and is a compact plant. This tropical plant with heart shaped leaves can grow from six to 10-inches tall. Even though it does not produce flowers, the glossy evergreen heart-shaped leaves on black stems give it a striking appearance. Providing your heart fern with indirect sunlight from a nearby window is the best choice. The heart fern likes to be moist at all times but never soggy. Letting your fern sit in too much water will cause root rot. Put water only when the first inch of soil is dry. This may be once a week or every other week, depending on the humidity in your home. Heart fern needs high humidity of at least 60 percent. Placing a humidifier nearby can help keep the air at the moisture level it needs. It could also help to use a pebble tray under the plant to create humidity.