Maidenhair Fern
Adiantum raddianum
Through the year 🗓️
☀️ Summer now
Check the soil daily in warm weather. Heat can dry the pot in 24 hours.
🍂 Fall
Stop feeding and trim off any fronds that crisped over summer to focus the plant.
❄️ Winter
Keep away from radiators and cold drafts, and hold humidity up even as growth pauses.
🌱 Spring
Divide and repot crowded clumps now, just as new fiddleheads emerge.
The details
Light & placement
- Light
- Bright indirect to medium; direct sun scorches the papery leaflets in minutes
- Ideal PPFD
- 100–200 µmol·m⁻²·s⁻¹
- Grow-light distance
- 24–36 in below LED
Water & feed
- Watering method
- Keep evenly moist, always: this fern has no drought tolerance at all. Bottom-watering or a self-watering pot saves most people.
- Fertilizer
- Balanced feed at ¼–½ strength, monthly in spring–summer.
Home & habit
- Soil
- Moisture-retentive mix rich in compost or peat, still free-draining; pH 5.5–6.5
- Humidity
- Very high (60%+); the deal-breaker in most homes
- Temperature
- 60–75 °F
- Mature size
- 12–20 in tall & wide
- Repotting
- Every 1–2 yrs in spring; likes being slightly snug
- Propagation
- Division of the rhizome clump in spring; spores for the patient.
When something looks wrong
- Overwatering signs
- Yellowing fronds with soggy soil; rotting black stems at the base
- Underwatering signs
- Entire fronds crisp and shrivel within a day of drying out
- Common pests
- Scale, mealybugs, spider mites (in dry air)
Common problems 🩺
The usual suspects when Maidenhair Fern looks unhappy. Most houseplant trouble is watering or light, not disease — see all plant problems if you are not sure which plant is the culprit.
Whole fronds crisping to a crunch
Likely cause
It dried out. Maidenhairs are unforgiving of a single missed watering.
What to do
Cut the crisped fronds to the base, keep the soil consistently moist, and give it high humidity. It regrows from the crown.
Sudden collapse
Likely cause
The soil went dry, even briefly.
What to do
Water immediately and never let it dry out again. A self-watering pot suits this plant well.
Scorched patches on the fronds
Likely cause
Direct sun.
What to do
Move it to bright indirect or medium light, well out of direct rays.
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