Boston fern is native to tropical and subtropical America, where it grows both in the ground and as an epiphyte. The species epithet exaltata means very tall in Latin, though in cultivation it settles into a more modest 2 to 3-foot mound of arching, pinnately compound fronds. Indoors, it wants bright indirect light, consistent moisture, and humidity — conditions found naturally near kitchens and bathrooms, or recreated by setting the pot on a tray of wet pebbles. In winter, ease off watering while the plant rests; standing moisture in dormancy invites root rot.

The dark brown to black dots arranged along the undersides of the fronds are spore cases, not insects or disease damage — a common source of alarm for first-time growers. Outdoors in Zones 10 and above, Boston fern shows invasive tendencies and should be managed accordingly. Scales and spider mites appear when indoor air becomes too dry. For everyone else, it remains one of the more effective air-purifying houseplants available, and few plants look better spilling from a hanging basket on a sheltered porch through the warmer months.