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Photo of Nephrolepis exaltata

© Homer Edward Price · CC BY 2.0 · Commons

Nephrolepis exaltata

Schwertfarn · (Nephrolepis exaltata)

Sword-fern family (Nephrolepidaceae)

Description

With its densely feathered, gently arching fronds, the Boston fern is one of the most popular hanging and houseplants, favouring the high humidity typical of tropical and subtropical forests. The whole plant is grown as decorative greenery year-round. Indoor air studies have credited the Boston fern with an ability to absorb formaldehyde, xylene and toluene, which is why it is frequently recommended as an air-purifying houseplant. Chemically it contains flavonoids such as astragalin and kaempferol derivatives, chlorogenic acid, and mucilaginous polysaccharides. According to the ASPCA it is non-toxic to dogs and cats, making it safe for households with children and pets as well. Care mainly requires balanced watering: waterlogged soil in the pot encourages mold growth.

  • RawWhole plantExternalClinical trial

    As a hanging houseplant, Nephrolepis exaltata is one of the most effective natural air humidifiers. The NASA study (Wolverton 1989) ranked it in the top group for reducing formaldehyde and xylene from indoor air.

    Sources: [1] [2] [3]

  • RawWhole plantExternalClinical trial

    In addition to formaldehyde, the Boston fern also absorbs xylene and toluene from indoor air — typical pollutants from paints, adhesives, and printer ink.

    Sources: [1] [2]

  • RawWhole plantExternalFolk medicine

    As a lush hanging plant with arching fronds, Nephrolepis exaltata is a decorative element in living rooms, bathrooms, and offices. The high transpiration noticeably improves the indoor climate.

    Sources: [2] [4]

  • RawWhole plantExternalTraditional use

    According to ASPCA, Nephrolepis exaltata is not toxic to either dogs or cats, and is also considered safe for small children. As one of the few houseplants with no toxic potential, the Boston fern is particularly recommended for family households.

    Sources: [2] [3]

Distribution in Europe

🪴 Grow at home

☀ Light
partial shade
💧 Water
every few days
🌱 Soil
Humus-rich soil, moist
🪴 Pot
22 cm
⭐ Difficulty
★★☆ intermediate
🐾 Pets
non-toxic — verified against the ASPCA list

Tips:

  • Loves the bathroom — high humidity and indirect light.
  • Never let it dry out — fronds turn brown immediately.
  • Mist regularly, especially in winter.

Care tips are general indoor-gardening recommendations, not scientific sources.

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