Boston Fern
Nephrolepis Exaltata
The Boston Fern, or Nephrolepis exaltata, is a popular houseplant known for its lush, feathery fronds and air-purifying qualities. Native to tropical regions, it thrives in humid environments, making it a favorite among indoor gardeners.
Everything it needs
9 essentials at a glance
Watering
Boston Ferns prefer consistently moist soil but should not be waterlogged.
Water when the top inch of soil feels dry, typically every 1-2 weeks. In summer, increase frequency as they may require watering every 5-7 days. Signs of over-watering include yellowing fronds and root rot, while under-watering leads to browning leaf tips and wilting.
Light
Boston Ferns thrive in indirect light or partial shade.
They prefer bright, filtered light but can tolerate low light conditions. Avoid direct sunlight as it can scorch the leaves. Ideally, they should receive 4-6 hours of indirect light daily.
Soil
The ideal soil for Boston Ferns is a well-draining, rich organic mix with a pH of 5.0 to 6.0.
A recommended potting mix includes peat moss, perlite, and compost to ensure good drainage and aeration.
Humidity
Boston Ferns thrive in high humidity levels of 50-70%.
To increase humidity, mist the fronds regularly, use a pebble tray with water, or place a humidifier nearby. Signs of humidity stress include browning leaf tips and frond drop.
Temperature
Boston Ferns prefer temperatures between 60-75°F (15-24°C) and are hardy in zones 9-11.
They can tolerate cooler temperatures but should be protected from frost. Avoid placing them near heat sources or cold drafts.
Fertilizing
Use a balanced liquid fertilizer with an NPK ratio of 20-20-20 or similar, diluted to half strength.
Fertilize every 4-6 weeks during the growing season (spring and summer). Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Prune Boston Ferns in early spring to remove dead or damaged fronds.
Use clean, sharp scissors or pruning shears. Regularly remove brown tips and spent fronds to encourage new growth and maintain a tidy appearance.
Repotting
Repot Boston Ferns every 1-2 years or when 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 and stunted growth. Carefully remove the plant from its pot, loosen the roots, and place it in fresh potting mix.
Propagation
Boston Ferns can be propagated through division or spores.
For division, carefully separate the root ball into smaller sections in spring, ensuring each section has roots and fronds. For spore propagation, collect spores from mature fronds, sow them on moist soil, and cover lightly. Keep the soil moist until they germinate.
When it's unhappy
Yellow leaves
Why it happens
Often caused by 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
Typically due to low humidity or under-watering.
How to fix it
Increase humidity levels by misting or using a humidifier, and ensure consistent watering.
Wilting fronds
Why it happens
Usually a sign of under-watering or extreme temperature fluctuations.
How to fix it
Check soil moisture and adjust watering schedule, ensuring the plant is kept in a stable environment.
Root rot
Why it happens
Caused by over-watering or poor drainage.
How to fix it
Allow the soil to dry out between waterings and ensure proper drainage in the pot.
Pests (e.g., spider mites, aphids)
Why it happens
Commonly attracted to stressed plants, particularly in low humidity.
How to fix it
Increase humidity and treat with insecticidal soap or neem oil as needed.
Care through the year
Spring
In spring, repot if necessary and begin a regular fertilizing schedule. Increase watering frequency as the plant starts to grow more actively.
Summer
During summer, maintain consistent moisture and humidity. Keep the fern in a cool spot away from direct sunlight and heat sources.
Fall
In fall, gradually reduce watering as growth slows. Monitor humidity levels as indoor air can become drier with heating.
Winter
In winter, keep the fern in a cool location with indirect light. Water less frequently, allowing the soil to dry slightly between waterings.
Toxicity & Safety
Boston Ferns are non-toxic to pets (cats, dogs) and children. They are safe to have around the home and do not pose any health risks if ingested.
Good to know
How often should I water my Boston Fern?
Water your Boston Fern when the top inch of soil feels dry, typically every 1-2 weeks. In hotter months, you may need to water more frequently.
Why are my Boston Fern's leaves turning yellow?
Yellow leaves can indicate over-watering or insufficient light. Adjust your watering schedule and ensure the plant is receiving adequate indirect light.
What humidity level is best for Boston Ferns?
Boston Ferns thrive in humidity levels of 50-70%. Increase humidity through misting or using a pebble tray with water.
Can I grow a Boston Fern in low light?
Yes, Boston Ferns can tolerate low light conditions, but they thrive best in bright, indirect light. Avoid direct sunlight to prevent leaf scorch.
How do I propagate my Boston Fern?
You can propagate Boston Ferns through division or spores. For division, separate the root ball in spring, ensuring each section has roots and fronds.
What should I do if my Boston Fern is wilting?
Wilting fronds may indicate under-watering or temperature stress. Check the soil moisture and ensure the plant is in a stable environment.
When is the best time to repot a Boston Fern?
Repot your Boston Fern every 1-2 years or when it becomes root-bound, ideally in early spring when the plant is actively growing.
Grows well with
Track this plant in your garden.
Set care reminders, log growth, and join a community of plant lovers.