How to Keep Your Ferns Healthy During the Winter Months

Ferns bring a touch of greenery and elegance to any home, but winter can pose challenges for keeping these lush plants thriving. If your ferns struggle as temperatures drop and indoor conditions change, don’t worry. With a little attention to their specific needs, you can ensure they remain vibrant and healthy until spring. Here’s a guide to keeping your ferns in top shape during the winter months.

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1. Understand Your Fern’s Needs

Ferns are native to humid, shaded environments, making them sensitive to dry air and low light—two common winter conditions. Familiarize yourself with the type of fern you have, as some varieties, like Boston ferns, are more cold-sensitive, while others, like the hardy Maidenhair fern, tolerate cooler temperatures better.

2. Provide Adequate Humidity

Dry indoor air from heating systems can quickly sap moisture from your ferns.

Increase humidity by:

• Placing a humidifier near your plants.
• Grouping your ferns together to create a micro-humid environment.
• Setting your fern’s pot on a tray filled with pebbles and water (ensure the pot’s base doesn’t touch the water).
• Mist your ferns lightly with water daily, especially if you notice browning or curling fronds.

3. Control Temperature and Drafts

Ferns prefer consistent temperatures between 65°F and 75°F. Sudden drafts or fluctuations can stress them. Keep your ferns away from:

• Heating vents or radiators.
• Drafty windows or doors.
• Cold floors; elevate the pots if needed.
• Use Weather Sealing Tape on Windows:

4. Adjust Watering Habits

Overwatering or underwatering are common mistakes during winter. Check the soil regularly and water only when the top inch feels dry. Use lukewarm water to avoid shocking the roots. Ensure the pot has good drainage to prevent root rot.

Automatic watering systems are a life saver! To install one is very inexpensive and makes a world of difference in the quality of your ferns. Here is the one Mark installed for me:

5. Maximize Light Exposure

Winter days are shorter, and light levels drop, which can affect your fern’s growth. Move your ferns to a bright, indirect light source, such as near an east- or north-facing window. If natural light is insufficient, consider using a grow light to supplement.

6. Trim and Clean Regularly

Dead or yellowing fronds can sap energy from your fern. Trim them off to encourage new growth. Dust can also accumulate on fronds, blocking light and moisture. Gently clean the leaves with a damp cloth or give your fern a lukewarm shower occasionally.

7. Feed Sparingly

Ferns grow more slowly in winter, so they require less fertilizer. Feed them lightly with a diluted houseplant fertilizer every 6-8 weeks, if at all. Over-fertilizing during dormancy can do more harm than good.

8. Repot Only if Necessary

Winter is not the ideal time to repot your fern, as it may be in a semi-dormant state. However, if the roots are severely cramped or you notice poor drainage, repot using fresh soil and a pot that’s only slightly larger than the current one.

9. Watch for Pests

Dry, indoor conditions can attract pests like spider mites and mealybugs. Inspect your fern regularly and treat infestations promptly with insecticidal soap or neem oil.

Why Winterize Your Ferns

Winter doesn’t have to be a challenging season for your ferns. By creating a humid, draft-free environment, adjusting your care routine, and providing adequate light, you can help your ferns remain lush and green throughout the colder months. With a little extra love, they’ll be ready to burst into full glory when spring arrives.

Fall in love with your garden! This adorable greenhouse was built by Ben Napier for his wife, Erin for Mother’s Day. Click on pic for details.