Air Purifying
Boston Fern
Nephrolepis exaltata
In short: Medium light · high water needs · non-toxic to cats and dogs (ASPCA)
Lush cascading fronds that add old-world charm. Boston Ferns thrive in humid bathrooms and shaded porches.
- Light
- Medium
- Water
- High
- Humidity
- High
- Growth
- Fast
- Mature size
- 2-3 feet wide, arching
- Temperature
- 55–75°F (13–24°C)
Ferns do not flower. They reproduce via spores that appear as brown dots on the undersides of mature fronds — these are normal and not pests.
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Overview
Boston Fern: The Classic Hanging Fern
The Boston Fern is a timeless houseplant with arching, feathery fronds that cascade beautifully from hanging baskets. It has been a porch and parlor staple since the Victorian era.
Humidity and Air
Boston Ferns are often listed among air-purifying plants, but at normal room scale the effect of a few houseplants on indoor air is negligible. Like all leafy plants, they release some moisture as they transpire.
Perfect Humidity Lover
- Thrives in bathrooms and kitchens
- Releases a little moisture as it transpires
- Non-toxic to pets
- Classic porch plant in warm climates
While they need more humidity than some houseplants, the right placement (bathroom or kitchen) makes care easy.
Watering
Keep soil consistently moist — Boston Ferns do not tolerate drying out. Water when the surface feels dry. They drink a lot, especially in warm weather. Mist fronds regularly. If the soil dries completely, fronds drop quickly and massively.
Light
Bright indirect light to partial shade. No direct sunlight. Morning sun is fine but harsh afternoon sun scorches the fronds. North or east-facing window is ideal. Does well under covered porches in warm climates.
Soil
Rich, moisture-retentive potting mix with added peat moss. The soil should stay consistently damp but still drain. Mix peat, potting soil, and perlite.
Fertilizing
Feed monthly during growing season with balanced liquid fertilizer at half strength. Ferns are sensitive to over-fertilizing — less is more. Stop in winter.
Propagation
Divide during repotting. Separate the root ball into sections, each with several fronds. Can also propagate from runners (stolons) that naturally emerge. Spore propagation is possible but difficult.
Repotting
Annually in spring. Boston Ferns grow fast. Use a slightly larger pot with good drainage. Hanging baskets with sphagnum moss liners are classic.
Common problems
Massive leaf drop: Dried out. Boston Ferns shed dramatically when underwatered. Soak thoroughly, increase humidity, and new growth returns.
Yellow fronds: Overwatering, too much light, or nutrient deficiency.
Brown tips: Low humidity or dry air. Mist daily or move to bathroom.
Messy shedding: Normal — all ferns drop some leaves. It is manageable, not a sign of problems.
Pro tips
Bathroom is best: Steam from showers provides perfect humidity effortlessly.
Monthly shower: Place in the shower and give a thorough lukewarm rinse — cleans fronds and hydrates deeply.
Winter rest: Growth slows in winter. Keep slightly cooler (55-65°F) and reduce watering slightly.
FAQ
Boston Fern questions
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