Light
Bright indirect • approx. 10,000–20,000 lux
Nephrolepidaceae
Nephrolepis exaltata 'Boston Blue Bell'
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- Representative photos:
Product images show a typical plant of this variety. Natural differences in leaf number, shape or variegation are normal, your plant will still match in type and quality.
- Size details:
Listed sizes refer to pot diameter (cm) and approximate overall height (cm) from the base of the pot to the tallest leaf or stem.
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- After delivery & first week , Unpacking, first placement, and early recovery.
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- Watering , When to water and how to avoid root rot.
- Substrates & roots, Potting mixes and drainage for strong root systems.
- Humidity, When humidity matters and what actually helps.
- Fertilizing, Simple feeding routine without burning roots.
- Problems & pests, Yellow leaves, brown tips, bugs, and fixes that work.
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Nephrolepis exaltata 'Boston Blue Bell'
Quick Care Guide
Watering
Water when ~10–20% dry
Substrate
Moisture-retentive but aerated • Evenly moist • Organic-leaning • Fine-medium
Temperature
Ideal: 18–24 °C • Avoid below: 10 °C
Humidity
Moist 50–60 %
Growth habit
Arching clumping terrestrial fern.
Support
not needed
Growth speed
High
Max size indoors
Max. height: 50 cm • Max. spread: 60 cm
Toxicity & safety
Non-toxic
Origin & habitat
Cultivar of Nephrolepis exaltata; species native to tropical and subtropical America
Outdoor growing
Outside from 12 °C · sheltered from wind
How to read these values
These care values are quick reference points for indoor growing. Use them as a guide, then adjust for pot size, substrate, temperature and how quickly the substrate dries.
For more detail, read the full product description or visit our Plant Care Guides.
- Light: level and approximate lux at leaf level.
- Watering: “% dry” shows how far the substrate should dry before watering again.
- Substrate: structure, drainage, moisture retention, base material and particle size.
- Temperature: “Ideal” shows the preferred range; “Avoid below” marks the cold-stress threshold.
- Humidity: target range; steady conditions usually matter more than exact numbers.
- Growth habit: how the plant grows, such as upright, climbing, trailing, clumping or rosette-forming.
- Support: whether a stake, pole or trellis is needed, optional or unnecessary.
- Growth speed: expected pace under suitable indoor conditions; use as a guide, not a promise.
- Max size indoors: realistic long-term indoor size under good conditions.
- Toxicity & safety: irritation, toxicity or physical hazards such as spines or bristles.
- Origin & habitat: native range, hybrid background or typical habitat where relevant.
- Outdoor growing: when a potted indoor plant can be placed outside and what outdoor protection it needs.
Nephrolepis exaltata 'Boston Blue Bell'
Nephrolepis exaltata 'Boston Blue Bell' is a Boston sword fern with soft green, arching fronds. Its fronds rise from a dense base, then curve outward as they lengthen, creating a full fern shape for hanging baskets, high shelves, and bright shaded plant corners.
As a cultivar of Nephrolepis exaltata, it belongs to the classic Boston fern group. The species is native to tropical and subtropical America, where it grows in humid, shaded habitats and can develop terrestrially or as an epiphyte. Indoors, it needs steady moisture, warmth, filtered light and air around the roots.
Arching fronds for baskets and raised planters
- Growth habit: Clump-forming fern with many fronds emerging from a central rhizomatous base.
- Frond movement: Long fronds arch outward as they mature, giving the plant a rounded shape for hanging pots.
- Leaf texture: Narrow pinnae create the fine, feathered surface associated with Boston sword ferns.
- Indoor placement: Bright shade gives the fronds light without hot direct sun.
- Renewal: New fronds rise from the centre while older outer fronds gradually age and can be trimmed away.
Boston fern habitat and indoor growth
Nephrolepis exaltata is an accepted fern species in Nephrolepidaceae. In habitat it grows in warm, humid places, including shaded ground and epiphytic positions, so its roots are adapted to moisture with good oxygen around them. Indoors, that means consistent watering and a substrate that drains cleanly.
'Boston Blue Bell' develops its shape as new fronds lift from the centre and then arch over the pot. Raised planters and hanging pots let that curve show clearly, while an evenly moist root ball keeps the plant producing fresh fronds.
Care for Boston Blue Bell Fern
- Light: Place in bright indirect light or soft filtered shade; direct midday sun can scorch the thin pinnae.
- Watering: Water when the upper layer starts to dry, keeping the root ball evenly moist through active growth.
- Substrate: Use a moisture-retentive but airy fern mix with fine bark, coco fibre, perlite, and a little humus.
- Pot choice: A hanging pot or raised planter gives the arching fronds room to curve, but drainage holes remain essential.
- Humidity: Keep humidity moderate to high with a humidifier, plant grouping, or a bright cabinet setup.
- Temperature: Aim for 18–26 °C indoors and keep the plant away from cold windows, heaters, and dry draughts.
- Feeding: Apply diluted fertiliser during spring and summer; flush the substrate occasionally to reduce salt build-up.
- Pruning: Cut old fronds at the base once they yellow or dry, leaving new central growth untouched.
- Propagation: Divide a full plant into sections with roots and growing points when repotting becomes necessary.
Problems to check on Boston Blue Bell Fern
- Crisp frond edges: Check humidity, watering gaps, and heat exposure; thin fern pinnae dry quickly in warm air.
- Pale weak growth: Move the plant closer to filtered light if new fronds stretch or appear sparse.
- Yellow lower fronds: Older fronds naturally age, but several at once can signal waterlogged substrate.
- Flattened basket growth: A pot set too close to a wall can press the arching fronds; give the plant space to curve outward.
- Hidden pests: Look along frond bases and undersides for scale, mealybugs, or mites before damage spreads.
Hanging pot and summer placement notes
Boston fern care depends on steady moisture with airflow, warmth, and filtered light. A lightly, evenly moist root ball keeps frond edges from drying quickly during warm indoor periods.
This cultivar can spend warm months outdoors in full shade or very gentle morning light. Acclimate gradually, keep the pot sheltered from wind, and bring it indoors before cool nights affect the frond base.
Pet and household safety
ASPCA lists Boston fern as non-toxic to cats and dogs. It is still sensible to keep the plant away from persistent nibblers, because eaten fronds can cause mild stomach upset through volume or texture.
Botanical name and species background
Nephrolepis comes from Greek words for kidney and scale, describing the kidney-shaped indusia on the spore-bearing structures. Exaltata means very tall or lofty. Nephrolepis exaltata is an accepted species first published by Schott in 1834, with the broader species native to tropical and subtropical America.
Nephrolepis exaltata 'Boston Blue Bell' develops soft arching fronds that fall naturally from raised pots, shelves and hanging planters.
Plant names, growth habits, natural habitats and indoor care guidance are checked against trusted botanical, habitat and horticultural references before publication.View our plant care resources and references.
FAQs about Nephrolepis exaltata 'Boston Blue Bell'
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