Soft Tree Fern
Dicksonia Antarctica
Dicksonia Antarctica, commonly known as the Soft Tree Fern or Tasmanian Tree Fern, is a stunning addition to any garden or indoor space. Native to Australia and Tasmania, this fern is prized for its lush, feathery fronds and ability to thrive in shaded, humid environments, making it a favorite among plant enthusiasts.
Everything it needs
9 essentials at a glance
Watering
Dicksonia Antarctica prefers consistently moist soil, so water it thoroughly when the top inch of soil feels dry.
In the growing season (spring and summer), water every 1-2 weeks, ensuring the soil remains damp but not soggy. During fall and winter, reduce watering to every 2-4 weeks. Signs of over-watering include yellowing fronds and root rot, while under-watering can cause fronds to wilt and turn brown.
Light
This fern thrives in partial shade, ideally receiving 4-6 hours of filtered sunlight daily.
Direct sunlight can scorch the fronds, so place it in a location where it receives dappled light or morning sun. It can tolerate low light conditions but may grow more slowly in such environments.
Soil
Dicksonia Antarctica prefers well-draining, rich organic soil with a pH range of 5.5 to 7.0.
A mix of peat, compost, and perlite is recommended for potting. Ensure good drainage to prevent waterlogging, which can lead to root rot.
Humidity
This tree fern enjoys high humidity levels of 50-80%.
To increase humidity, mist the fronds regularly, use a pebble tray with water, or place a humidifier nearby. Signs of humidity stress include browning leaf tips and fronds that become crispy.
Temperature
Ideal temperatures for Dicksonia Antarctica range from 60-75°F (15-24°C).
It is hardy in zones 9-11 and can tolerate brief drops to 40°F (4°C). Protect it from frost and extreme heat, as prolonged exposure can damage the fronds.
Fertilizing
Use a balanced liquid fertilizer with an NPK ratio of 10-10-10, diluted to half strength.
Fertilize every 4-6 weeks during the growing season and reduce frequency in fall and winter. Signs of nutrient deficiency include pale fronds and stunted growth.
Pruning
Prune Dicksonia Antarctica in early spring to remove any dead or damaged fronds.
Use clean, sharp pruning shears to cut fronds at the base. Regularly removing old fronds encourages new growth and maintains the plant's appearance.
Repotting
Repot every 2-3 years or when the plant becomes root-bound, indicated by roots growing out of the drainage holes.
Choose a pot that is 1-2 inches larger in diameter. Gently remove the plant, refresh the soil, and place it in the new pot, ensuring the crown is at soil level.
Propagation
Propagation is typically done through division.
In spring, carefully remove the plant from its pot and divide the root ball into sections, ensuring each section has fronds and roots. Replant each division in a suitable potting mix. Alternatively, spores can be collected and sown in a sterile medium, but this method is more complex and time-consuming.
When it's unhappy
Yellowing fronds
Why it happens
Typically caused by over-watering or nutrient deficiency.
How to fix it
Check soil moisture levels and adjust watering. Fertilize if nutrient deficiency is suspected.
Browning leaf tips
Why it happens
Often a result of low humidity or underwatering.
How to fix it
Increase humidity through misting or a humidifier, and ensure consistent watering.
Wilting fronds
Why it happens
Usually due to under-watering or extreme heat.
How to fix it
Water the plant thoroughly and move it to a cooler location if necessary.
Root rot
Why it happens
Caused by over-watering and poor drainage.
How to fix it
Remove the plant from the pot, trim away rotten roots, and repot in fresh, well-draining soil.
Pests (e.g., scale, aphids)
Why it happens
Can occur if the plant is stressed or in poor health.
How to fix it
Treat with insecticidal soap or neem oil, and maintain plant health to prevent infestations.
Care through the year
Spring
In spring, increase watering as the plant begins to grow actively. Fertilize every 4-6 weeks and prune any dead fronds to encourage new growth.
Summer
Maintain consistent moisture and humidity levels, providing shade from the hottest afternoon sun. Monitor for pests and continue fertilizing.
Fall
Reduce watering frequency as growth slows down. Prepare the plant for cooler temperatures by ensuring it is not exposed to drafts.
Winter
Water less frequently, allowing the soil to dry out slightly between waterings. Protect the plant from frost and maintain humidity indoors.
Toxicity & Safety
Dicksonia Antarctica is non-toxic to pets and children. It poses no significant health risks if ingested, but large quantities may cause mild gastrointestinal upset.
Good to know
How often should I water my Dicksonia Antarctica?
Water your Dicksonia Antarctica when the top inch of soil feels dry, typically every 1-2 weeks during the growing season and less frequently in winter.
What light conditions are best for a Soft Tree Fern?
Dicksonia Antarctica thrives in partial shade, receiving 4-6 hours of filtered sunlight daily. Avoid direct sunlight to prevent leaf scorch.
Can I grow Dicksonia Antarctica indoors?
Yes, you can grow this fern indoors, but ensure it receives adequate humidity and indirect light. A bright, humid bathroom or kitchen works well.
What is the ideal humidity for Dicksonia Antarctica?
This fern prefers humidity levels of 50-80%. Increase humidity by misting the fronds or using a pebble tray with water.
How do I propagate Dicksonia Antarctica?
Propagation is best done through division in spring. Carefully separate the root ball into sections, ensuring each has fronds and roots, then replant.
What should I do if my fern's fronds are turning brown?
Browning fronds may indicate low humidity or underwatering. Increase humidity and check your watering routine to ensure the plant is adequately hydrated.
When is the best time to repot Dicksonia Antarctica?
Repot every 2-3 years or when the plant is root-bound, preferably in early spring when new growth begins.
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