Boston fern (Nephrolepis exaltata) are one of the best air-purifying plants and a classic favorite for homes, patios, and gardens. With their lush, feathery fronds, they add a touch of elegance and freshness to any space.
But despite their beauty, Boston ferns can be a bit tricky to care for if you don’t know what they need. They love humidity, indirect light, and consistent moisture, and without the right conditions, they can quickly develop brown, crispy fronds.
In this complete care guide, we’ll cover everything you need to know to keep your Boston fern healthy, vibrant, and thriving.
Why Grow a Boston Fern?
Boston ferns are more than just pretty plants—they come with several benefits:
✅ Air Purification – Removes toxins and improves indoor air quality.
✅ Humidity Booster – Adds moisture to dry indoor air.
✅ Pet-Friendly – Safe for cats and dogs.
✅ Elegant & Versatile – Perfect for hanging baskets, pots, or outdoor gardens.
✅ Low Maintenance (With the Right Care) – Once you meet their needs, they flourish beautifully!
Now, let’s dive into how to care for your Boston fern.
1. The Best Light for a Boston Fern
Boston ferns thrive in bright, indirect light, similar to the dappled sunlight of a forest floor.
☀ Ideal Light Conditions:
✔ Indoors: Place near a north- or east-facing window where it gets filtered light.
✔ Outdoors: Keep in a shady or partially shaded spot (like a covered patio or under trees).
✔ Avoid Direct Sunlight! Too much sun can scorch the delicate fronds, making them dry and brown.
If your home has low light, consider using a grow light to keep your fern happy.
2. How to Water a Boston Fern
Watering is one of the most important aspects of Boston fern care. These plants love moisture but don’t like soggy roots.
💧 How Often to Water:
✔ Indoors: Water 2-3 times a week, ensuring the soil stays consistently moist.
✔ Outdoors: Water daily in hot weather, especially if in a hanging basket.
✔ Winter Care: Reduce watering to once a week as growth slows down.
Pro Tip: Always check the top inch of soil—if it feels dry, it’s time to water. If the soil is soggy, hold off on watering to prevent root rot.
3. The Right Humidity for a Boston Fern
Boston ferns are tropical plants, meaning they love high humidity. Without enough moisture in the air, the fronds turn brown and crispy.
💦 How to Increase Humidity:
✔ Mist the leaves daily with water.
✔ Place the pot on a tray of pebbles and water (humidity tray).
✔ Use a humidifier if your home has dry air.
✔ Keep ferns in a bathroom or kitchen, where humidity is naturally higher.
If your Boston fern looks dry or brittle, increasing humidity can quickly revive it!
4. The Best Soil for Boston Ferns
For healthy root growth, Boston ferns need light, well-draining soil that holds moisture without becoming soggy.
🌿 Best Soil Mix:
✔ Peat-based potting mix (retains moisture)
✔ Added perlite or sand (improves drainage)
✔ Rich in organic matter (promotes healthy growth)
Avoid heavy or clay-like soils, as they can lead to root rot.
5. How to Fertilize a Boston Fern for Lush Growth
Boston ferns don’t need a lot of fertilizer, but feeding them occasionally will keep the fronds lush and green.
🌱 Best Fertilizers & Feeding Schedule:
✔ Use a balanced liquid fertilizer (like 10-10-10) once a month in spring and summer.
✔ For organic feeding, use diluted fish emulsion or compost tea.
✔ Skip fertilizer in winter, as the plant enters dormancy.
Too much fertilizer can burn the leaves, so always dilute it to half strength before applying.
6. How to Prune a Boston Fern
Pruning helps maintain the shape and health of your fern.
✂ How to Prune Boston Ferns:
✔ Trim off yellow or brown fronds at the base.
✔ Cut back leggy, overgrown stems to encourage bushy growth.
✔ If the plant looks messy, trim the entire fern by a third in early spring to promote fresh new growth.
Pruning keeps your fern looking full and vibrant while preventing dead fronds from taking over.
7. Repotting a Boston Fern
Boston ferns grow quickly and may need repotting every 1-2 years.
🪴 How to Repot a Boston Fern:
- Choose a pot 1-2 inches larger than the current one.
- Use fresh, well-draining soil to prevent compacted roots.
- Carefully remove the fern, loosen the roots, and place it in the new pot.
- Water thoroughly and keep in a humid environment for a few days to reduce shock.
If your fern is root-bound (roots tightly packed), repotting will revive its growth.
8. Common Problems & How to Fix Them
Even with the best care, Boston ferns can face a few issues. Here’s how to troubleshoot:
Brown, Crispy Leaves → Dry Air or Underwatering
✔ Increase humidity with misting or a pebble tray.
✔ Water more frequently but avoid overwatering.
Yellowing Fronds → Overwatering or Poor Drainage
✔ Let soil dry slightly between waterings.
✔ Ensure pot has good drainage holes.
Drooping or Wilting → Lack of Humidity or Overwatering
✔ Check if the soil is too wet or too dry.
✔ Increase humidity and place in bright, indirect light.
Pests (Spider Mites, Mealybugs, Scale) → Dry Air or Weak Plant
✔ Spray with neem oil or insecticidal soap.
✔ Keep leaves clean and misted to discourage pests.
Final Thoughts: Keeping Your Boston Fern Thriving
Boston ferns are stunning, classic houseplants that can thrive for years with the right care. To keep your fern lush and green, remember these key tips:
✔ Bright, indirect light – No harsh direct sun!
✔ Water regularly – Keep the soil moist but not soggy.
✔ High humidity – Mist daily or use a humidity tray.
✔ Prune and repot – Trim dead fronds and refresh soil when needed.
With a little attention and love, your Boston fern will stay full, vibrant, and beautiful all year long!
