Overview
Didymochlaena truncatula, commonly known as the Tree Maidenhair Fern or Mahogany Fern, is a distinctive maidenhair-type fern that slowly develops a short trunk as it matures — giving rise to its “tree fern” nickname.
This elegant species is admired for its graceful, arching fronds and rich colouring. New fronds emerge in warm mahogany and bronze tones, gradually maturing into a deep, glossy green. In ideal conditions, it becomes a striking architectural plant that brings a lush, tropical feel to indoor and shaded outdoor spaces.
In nature, Didymochlaena truncatula grows as a forest understory fern, thriving in moist, well-drained soil and filtered light. In cultivation, it is most commonly grown as a feature indoor plant.
Why Grow a Tree Maidenhair Fern?
- Visually striking foliage with changing colour as fronds mature
- Naturally helps improve indoor air quality
- Ideal for containers, indoor displays, patios, and shaded garden beds
- Long-lived and architectural, improving with age
Natural Habitat & Growth Habit
- Environment: Tropical and subtropical forest understory
- Growth habit: Slow-growing, trunk-forming fern
- Patience required: Trunk development can take several years
Mature size:
- Height: Up to 2 metres over time
- Spread: Approximately 0.5–1 metre
- Growth rate: Slow
Light Requirements
Didymochlaena truncatula prefers a bright, well-lit position with indirect or filtered light.
- Ideal locations include rooms with bright ambient light or shaded outdoor areas
- Avoid direct sunlight, which can scorch fronds and cause leaf damage
- Filtered light closely mimics its natural forest habitat and promotes healthy growth
Soil & Potting
For best results, use a moist, well-draining potting mix.
- An African Violet potting mix works particularly well for indoor plants Perlite, peat moss, and pine bark.
A simple soil recipe is Equal parts (1:1:1 ratio) of sphagnum, peat moss (or coco coir), perlite, and vermiculite. Use coconut coir, or wood bark fibre as a peat moss alternative.
Or Try:
(50%) Peat moss or coco coir
25% perlite - 25% vermiculite
- Soil should retain moisture without becoming waterlogged
- Containers must have good drainage
This fern prefers to be slightly root-bound, so repot only when necessary.
Watering
Consistent moisture is essential.
- Keep soil moist at all times, but not soggy
- Water when the top 2–3 cm of soil begins to dry
- Never allow the plant to fully dry out
Signs of underwatering include drooping fronds, wilting, and browning leaf tips. In warmer or brighter environments, bottom watering or placing pots in shallow trays of water can help maintain even moisture.
Humidity
As a tropical fern, Didymochlaena truncatula benefits from moderate to high humidity.
- Low humidity may cause crispy brown edges or patches on the leaves
- Improve humidity by misting, grouping plants together, or positioning near other foliage
- No specialised humidity equipment is usually required
Temperature
This fern adapts well to indoor conditions.
- Ideal temperature range: 18–24°C
- Protect from cold drafts and sudden temperature changes
Feeding & Fertiliser
Regular feeding supports healthy foliage and steady growth.
- Use a balanced liquid fertiliser at half strength
- Feed once a month from mid-spring to late summer only
- Avoid fertilising during autumn and winter
A combination of filtered light, adequate humidity, and regular feeding will noticeably improve growth and overall plant health.
Propagation
Propagation is typically achieved by:
- Dividing large, mature clumps, or
- Growing from spores (a slow and more advanced method)
Repotting & Root Care
- Repot only when the plant becomes root-bound
- Use a well-draining mix and a slightly larger pot
- Roots are very fine and hair-like, so handle gently
- Disturb the root ball as little as possible to reduce stress
Key Care Summary (Quick Reference)
- Light: Bright, indirect or filtered
- Water: Keep consistently moist
- Humidity: Moderate to high
- Temperature: 18–24°C
- Growth rate: Slow
- Best use: Indoor containers, shaded patios, feature plants
We are Asked
Does the Tree Maidenhair Fern really grow a trunk?
Yes — over time, this fern develops a short trunk, which is why it is often called the Tree Maidenhair Fern. Trunk formation is very slow and can take several years, even under ideal conditions.
How fast does Didymochlaena truncatula grow?
Growth is considered slow. New fronds typically appear during spring and summer, with minimal growth during cooler months. Patience is key with this species.
Why are the new fronds a different colour?
New fronds emerge in mahogany or bronze tones, which gradually deepen to green as they mature. This colour change is natural and one of the plant’s most attractive features.
Does this fern need high humidity?
Didymochlaena truncatula prefers moderate to slightly higher humidity, but it does not require specialised equipment. Normal indoor humidity is often sufficient, especially if plants are grouped together or lightly misted.
More Ferns
Where To Buy
PLANTSMITH 107 High St, Preston, Victoria, 3072
PARADISE DISTRIBUTORS – 07 5441 5921