Boston Fern
Nephrolepis exaltata
Also called: Sword Fern
Boston Fern. Nephrolepis exaltata, the Boston fern or sword fern, is a tropical evergreen fern native to humid forests of Florida, the West Indies, Central America, and northern South America. Arching pinnate fronds 2–3 feet long form a fountaining clump; the 'Bostoniensis' cultivar discovered in a Boston shipment in 1894 launched the plant's enduring popularity as the classic Victorian parlor fern. Confirmed non-toxic to dogs and cats.
Growing & care
- Light: bright indirect. Direct sun scorches fronds; deep shade produces sparse fronds.
- Water: keep evenly moist at all times. Boston ferns will not forgive even one missed watering — fronds turn brown and crispy in days.
- Humidity: 50%+ minimum; 60–80% ideal. Bathrooms with windows are excellent locations.
- Soil: rich, organic, well-drained potting mix. Add extra peat or coco coir for moisture retention.
- Temperature: 60–75°F. Avoid drafts and dry forced-air heat in winter.
- Outdoors: USDA zones 9–11 year-round; grown as a summer porch plant elsewhere and brought indoors before first frost.
Propagation
Divide overgrown clumps in spring by cutting the entire root ball into wedges with a sharp knife — each division needs at least 4–6 fronds and visible rhizome. Runners (stolons) form along the soil surface and root naturally at nodes; pin them down with a small stone to encourage rooting, then separate. Spore propagation is possible but slow and impractical for home growers.
Common problems
Massive leaflet drop in winter is almost always low humidity and dry forced-air heat — relocate to a brighter, more humid spot or run a humidifier. Brown frond tips signal under-watering or low humidity. Yellow fronds usually mean overwatering or insufficient light. Boston fern is one of the few houseplants confirmed non-toxic to dogs and cats per ASPCA listings — an excellent pet-safe alternative to common toxic houseplants.
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