How to Keep Ferns Alive in Winter

By Marcus Williams · January 23, 2026

How to Keep Ferns Alive in the Winter: Quick Summary

To keep ferns alive in winter, maintain consistent moisture, provide high humidity (40–60%), and place them in bright, indirect light. Avoid cold drafts, heating vents, and temperatures below 50°F (10°C). Use a humidifier or pebble tray, water when the top inch of soil feels dry, and avoid fertilizing during dormancy.

Why Ferns Struggle in Winter

Ferns are naturally adapted to humid, shaded forest environments. Indoor winter conditions often create challenges due to:

Dry air: Indoor heating reduces humidity below 30%, causing frond browning.
Low light: Shorter days reduce light intensity, slowing growth.
Cold drafts: Proximity to windows or doors exposes ferns to sudden temperature drops.
Over- or under-watering: Erratic watering habits damage roots during low-evaporation months.

Key Winter Care Requirements for Ferns

Light Needs

Ferns require bright, indirect sunlight year-round. In winter, maximize exposure by placing them near north- or east-facing windows. Rotate pots weekly for even growth.

Temperature Range

Keep ferns in a stable environment between 55°F and 70°F (13–21°C). Avoid placing near radiators, fireplaces, or drafty entryways.

Humidity Levels

Aim for 40–60% relative humidity. Use a digital hygrometer to monitor levels. Increase humidity with:

Pebble trays filled with water
Room humidifiers (ideal for dry climates)
Grouping plants together

Watering Guidelines

Water when the top 1 inch (2.5 cm) of soil feels dry. Reduce frequency compared to summer but never let soil fully dry out. Use room-temperature, filtered, or distilled water to prevent chlorine damage.

Fertilization

Suspend fertilizing from November to February. Ferns enter semi-dormancy and excess nutrients can cause salt buildup and root burn.

Best Indoor Ferns for Winter Survival

Some fern species tolerate indoor winters better than others. Choose resilient varieties such as:

Nephrolepis exaltata (Boston Fern)
Platycerium bifurcatum (Staghorn Fern)
Pellaea rotundifolia (Button Fern)
Adiantum raddianum (Maidenhair Fern) – more challenging but possible with extra care

Fern Type	Min Winter Temp (°F)	Humidity Requirement	Light Preference	Water Frequency (Winter)
Boston Fern	50°F	50–60%	Bright, indirect	Every 7–10 days
Maidenhair Fern	55°F	60–70%	Medium to bright indirect	Every 5–7 days
Staghorn Fern	50°F	50–60%	Bright, indirect	Mist 2–3x/week + soak monthly
Button Fern	45°F	40–50%	Low to medium indirect	Every 10–14 days
Japanese Holly Fern	50°F	45–55%	Low to medium indirect	Every 10 days

Table data source:1, 2, 3

The table shows that Boston and Button Ferns are among the most adaptable to typical indoor winter settings. Maidenhair Ferns demand higher humidity and warmer temps, making them less forgiving. Button Ferns tolerate cooler temps and lower humidity, ideal for beginners.

Common Winter Problems and Solutions

Yellowing or Dropping Fronds

This often results from overwatering or poor drainage. Ensure pots have drainage holes and use a well-aerated potting mix (e.g., peat-based with perlite).

Brown Leaf Tips

Caused by low humidity or chemical buildup in tap water. Switch to distilled water and increase ambient moisture using a humidifier.

Leggy Growth or Sparse Foliage

Indicates insufficient light. Move closer to a natural light source or supplement with a full-spectrum LED grow light for 10–12 hours daily.

About Winter Fern Care: Common Questions

Can I keep my outdoor ferns alive indoors during winter?

Yes, many outdoor ferns like Autumn Fern (Dryopteris erythrosora) can be brought indoors before the first frost. Acclimate them gradually over 7–10 days and inspect for pests before moving inside.

Should I mist my fern in winter?

Misting offers temporary humidity relief but isn't sufficient alone. It can also promote fungal issues if leaves stay wet overnight. Combine misting with a humidifier or pebble tray for best results.

How often should I water ferns in winter?

Most ferns need watering every 7–14 days in winter, depending on species and home conditions. Always check soil moisture first; water only when the top inch feels dry.

Do ferns go dormant in winter?

Many ferns enter a semi-dormant phase with slowed growth. They still require light and moisture but no fertilizer. This rest period supports healthier spring regrowth.

Why is my fern losing leaves in winter?

Some leaf drop is normal during winter dormancy. However, excessive loss signals stress from dry air, cold drafts, or inconsistent watering. Adjust care conditions promptly to prevent decline.