Narrow Swordfern
Nephrolepis cordifolia
The Narrow Swordfern, or Nephrolepis cordifolia, is a lush, hardy fern known for its elegant fronds and adaptability to low light. Native to tropical regions, it is a popular choice for indoor spaces and shaded gardens, providing a touch of greenery and air purification.
Everything it needs
9 essentials at a glance
Watering
Water the Narrow Swordfern when the top inch of soil feels dry.
During the growing season (spring and summer), water once a week, ensuring the soil is evenly moist but not soggy. In fall and winter, reduce watering to every 10-14 days. Signs of over-watering include yellowing fronds and root rot, while under-watering may cause browning leaf tips and wilting.
Light
This fern thrives in partial shade to full shade, making it ideal for indoor spaces or shaded garden areas.
It prefers indirect light and can tolerate low light conditions, but avoid direct sunlight as it can scorch the leaves. Aim for 4-6 hours of filtered light daily for optimal growth.
Soil
The Narrow Swordfern prefers a well-draining, rich organic potting mix with a pH range of 5.5 to 7.0.
A mix of peat, pine bark, and perlite is ideal to ensure good drainage while retaining some moisture. Ensure the pot has drainage holes to prevent water accumulation.
Humidity
This fern enjoys high humidity levels, ideally between 50-70%.
To increase humidity, consider misting the fronds regularly, using a pebble tray with water, or placing a humidifier nearby. Signs of low humidity stress include browning leaf edges and curling fronds.
Temperature
The ideal temperature range for the Narrow Swordfern is between 60-75°F (15-24°C).
It is hardy in USDA zones 9-11 and can tolerate brief periods of cooler temperatures down to 50°F (10°C). Protect it from frost and extreme heat, as it prefers a stable environment.
Fertilizing
Use a balanced liquid fertilizer with an NPK ratio of 10-10-10 or 20-20-20, diluted to half strength.
Fertilize every 4-6 weeks during the growing season, and reduce to once every 2-3 months in fall and winter. Signs of nutrient deficiency include pale fronds and stunted growth.
Pruning
Prune the Narrow Swordfern in early spring to remove any dead or damaged fronds.
Use clean, sharp scissors or pruning shears to cut fronds at the base. Regularly remove yellowing fronds to promote new growth and maintain the plant's appearance.
Repotting
Repot the Narrow Swordfern every 1-2 years or when it becomes root-bound.
Choose a pot that is 1-2 inches larger in diameter. Signs it needs repotting include roots growing out of the drainage holes or water not absorbing properly. To repot, gently remove the plant from its current pot, loosen the roots, and place it in fresh potting mix.
Propagation
Propagation can be achieved through division or spores.
For division, carefully separate the plant into smaller sections during the spring, ensuring each section has roots. Replant immediately in fresh potting mix. If using spores, collect them from mature fronds, sow on a moist substrate, and keep in a humid environment until germination occurs.
When it's unhappy
Yellow leaves
Why it happens
Over-watering or insufficient light.
How to fix it
Adjust watering frequency and ensure the plant receives adequate indirect light.
Browning leaf tips
Why it happens
Low humidity or under-watering.
How to fix it
Increase humidity levels and water more frequently, ensuring the soil remains moist.
Wilting fronds
Why it happens
Under-watering or root rot.
How to fix it
Check soil moisture and adjust watering; if root rot is present, repot in fresh, dry soil.
Pests (like spider mites)
Why it happens
Dry indoor conditions.
How to fix it
Increase humidity and treat with insecticidal soap or neem oil as needed.
Stunted growth
Why it happens
Nutrient deficiency or root-bound.
How to fix it
Fertilize appropriately and consider repotting if the plant is root-bound.
Care through the year
Spring
In spring, increase watering as the plant begins to grow actively. Fertilize every 4-6 weeks and prune any dead fronds to encourage new growth.
Summer
Maintain consistent moisture and humidity levels during the hot summer months. Keep the fern in a shaded area to prevent leaf burn.
Fall
Reduce watering frequency as growth slows down. Fertilize less often, about every 2-3 months, and monitor for pests as indoor conditions change.
Winter
Water less frequently, allowing the soil to dry out slightly between waterings. Keep the fern in a cool, well-lit area away from drafts.
Toxicity & Safety
The Narrow Swordfern is non-toxic to pets and children, making it a safe choice for households. No parts of the plant are known to cause harm if ingested.
Good to know
How often should I water my Narrow Swordfern?
Water your Narrow Swordfern when the top inch of soil feels dry, typically once a week during the growing season and every 10-14 days in winter.
What light conditions are best for my Narrow Swordfern?
This fern thrives in partial to full shade, preferring indirect light. Avoid direct sunlight to prevent leaf scorch.
How can I increase humidity for my Narrow Swordfern?
You can increase humidity by misting the fronds, using a pebble tray with water, or placing a humidifier nearby to create a more favorable environment.
What should I do if my Narrow Swordfern has yellow leaves?
Yellow leaves can indicate over-watering or insufficient light. Adjust your watering schedule and ensure the plant receives adequate indirect light.
When is the best time to repot my Narrow Swordfern?
The best time to repot is every 1-2 years in early spring when the plant is actively growing and can recover quickly.
Is the Narrow Swordfern safe for pets?
Yes, the Narrow Swordfern is non-toxic to both pets and children, making it a safe addition to your home.
How do I propagate my Narrow Swordfern?
You can propagate by division in spring or by collecting and sowing spores. Ensure each division has roots for successful replanting.
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