Boston Fern (Smithii Cultivar) (Nephrolepis exaltata Smithii)

Boston Fern (Smithii Cultivar)

Nephrolepis exaltata Smithii

Lacy fronds drape like soft green waterfalls, a classic indoor air purifier. Evergreen fern.

Partial sun
2–3/week
Beginner
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Plant Needs

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Sunlight Bright indirect light; avoid direct midday sun which scorches fronds, tolerates low light temporarily
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Watering Keep soil consistently moist but not waterlogged; use room-temperature water to prevent root shock
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Temperature Thrives at 15–21°C; avoid cold drafts and temperatures below 10°C to prevent frond browning
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Characteristics

  • Fronds: Arching, finely divided lacy bright green leaflets; Smithii cultivar has tighter, more compact growth
  • Rhizomes: Creeping wiry underground stems that produce new frond shoots
  • Sori: Brown spore clusters on undersides of mature leaflets
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Care Guide

Watering

Keep soil evenly moist; mist fronds 2–3 times weekly to boost humidity

Fertilization

Diluted balanced feed every 4 weeks. Discontinue fertilization in autumn and winter to prevent nutrient buildup

Banana peel compost tea:Compost banana peels for 2 weeks, steep in water 24 hours, dilute 1:20 for root drench; avoid over-fertilizing to prevent frond burn
Pruning
  • Trim browned frond tips or entire dead fronds at the base to maintain tidy appearance
  • Remove old, yellowing fronds to redirect energy to new growth
  • Divide overcrowded clumps in spring to propagate and refresh the plant
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-verified non-toxic; safe for cats

Humans: Non-toxic; no known adverse effects from ingestion or contact

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Garden Uses & Culture

Culture: Symbolizes humility and sincerity; valued for natural air-purifying properties

Usage: Indoor ornamental hanging basket plant, shaded garden groundcover