How to Grow Boston Ferns Inside

Maintain moist soil conditions. It should not be saturated, nor dry out completely. When the soil feels dry to the touch, water it thoroughly with room temperature water so a little bit of water runs out of the drainage holes and into the drainage dish. Discard the excess water in the dish so the plant is not sitting in water.

Place a Boston fern plant where it has good air circulation all around the plant. Also, it usually fares well about 3 feet away from a sunny window, or next to a north facing window, where it receives a lot of indirect light. During the winter, though, when the days are short, move it temporarily next to an east facing window.

Fertilize a Boston fern during its growing season, usually from April until September. Use a liquid fertilizer labeled for house plants and use only half of the recommended strength.

Repot a Boston fern every three to four years, in the spring. Use new potting soil that is labeled as "soil-less" and contains at least 50 percent peat moss. Plant a Boston fern back to the same depth as it was planted before. This is the time to divide the plant as well if it has become too large or you want to propagate new plants. To do this, separate the rhizomes with your hands or clean knife (keep the foliage intact as much as possible) and replant the divisions in different pots.