Can You Propagate Kangaroo Fern? Step-by-Step Guide

The most reliably way to propagate a Kangaroo fern (Microsorum diversifolium) by division in spring, separating the rhizome into sections each carrying at least two to three fronds and a length of healthy rhizome.

Rhizome cuttings are a second option when the plant is large but division would be too disruptive.

Spore propagation is possible but takes six months to a year and is rarely worth attempting for a plant that divides so easily.

The most important rule for all methods: the surface rhizome must never be buried after propagation, as burying it causes rot and kills the new plant.

I divided my first Kangaroo Fern after about two years, when it had outgrown its pot and the rhizome was creeping over the rim.

I made the mistake of pressing the rhizome sections flat against the soil surface when I repotted, which caused the new divisions to struggle for weeks.

Once I understood that this plant grows with its rhizome sitting on top of the medium rather than below it, every subsequent division established quickly and cleanly.

That single piece of information makes the difference between success and failure with this species.

Understanding the Kangaroo Fern Before You Propagate

Before propagating, it helps to understand what kind of plant you are working with.

Microsorum diversifolium is an epiphytic fern, meaning it grows naturally on the surfaces of rocks and tree trunks in Australia and New Zealand rather than in deep soil.

It has a creeping surface rhizome, a thick stem-like structure from which fronds emerge, that travels horizontally across the growing surface.

This rhizome is the key to propagation: every method for multiplying this plant involves cutting or separating sections of rhizome.

Because the plant is epiphytic, its roots and rhizome are adapted to growing in open, well-aerated conditions with good air circulation, not in dense, moisture-retentive soil.

This has two direct consequences for propagation: the growing medium for cuttings needs to be open and free-draining, and the rhizome must always sit on the surface rather than being pressed into or buried beneath the medium.

The Rhizome Rule: The Single Most Important Thing to Know

Every propagation method for Kangaroo Fern depends on one rule: the rhizome sits on the surface of the growing medium, never below it.

This is the opposite of how most houseplants are planted, and it is where most first-time propagators go wrong.

The rhizome is not a root. It is a modified stem that produces both fronds above and roots below.

When you bury it, the section below the surface cannot breathe, stays too wet, and rots.

The roots that hang down from the rhizome into the medium do the water-gathering work; the rhizome itself needs to remain above the soil surface in open air.

In practice, this means pressing the rhizome lightly onto the surface of the medium and anchoring it in place with a small U-shaped wire pin, a toothpick pushed horizontally through it, or a small pebble placed gently on top.

The roots will grow down into the medium on their own within two to three weeks.

Method 1: Division (Easiest and Most Reliable)

Division is the most straightforward propagation method for Kangaroo Fern and gives the fastest results.

A mature plant with multiple frond clusters or a rhizome that has grown long enough to have distinct sections is ready to divide.

Spring is the best time, as the plant is entering its active growth phase and recovers fastest from the stress of division.

Signs the Plant Is Ready to Divide

• Roots emerging from drainage holes consistently
• Rhizome creeping over the edge of the pot
• Multiple distinct frond clusters visible from above
• Plant noticeably slowing its growth despite correct care
• The plant has been in the same pot for two to three years

What You Need

Recommended Propagation Medium

Do not use standard potting compost alone. Kangaroo Fern divisions need a free-draining, aerated medium that holds moisture without becoming waterlogged. A suitable mix is:

• 40% coco coir or peat-free compost
• 30% perlite
• 20% medium orchid bark
• 10% worm castings (optional but beneficial)

If you do not want to make a custom mix, a commercial orchid potting mix blended with an equal volume of perlite works well.

The goal is a medium that drains fast enough that the base of the rhizome never sits in sustained moisture.

Step-by-Step Division

1. Water the parent plant one day before dividing. A hydrated plant handles the stress of division more easily than a dry one, and the roots release from the medium more cleanly.
2. Remove the plant from its pot by tilting it sideways and supporting the base. Do not pull by the fronds or rhizome.
3. Lay the plant on a clean surface and assess the rhizome structure. Identify the natural separation points where distinct frond clusters emerge from separate rhizome sections. Each division needs at least two to three fronds and a rhizome section of at least 3 to 4 inches.
4. Sterilize your blade with 70% isopropyl alcohol. Cut cleanly through the rhizome at your chosen division points. Do not saw; make a single clean cut.
5. Dust all cut ends with powdered cinnamon or activated charcoal. This reduces infection at the wound site and is particularly important in humid conditions where fungal spores are present.
6. Allow the cut ends to air-dry for 30 to 60 minutes before potting. This brief drying period helps the cut surface callous slightly before it contacts moist medium.
7. Fill each pot with the propagation medium to about an inch below the rim. Mist the medium lightly so it is barely damp but not wet.
8. Place each rhizome section on top of the medium with the frond bases upright. Do not press it in or cover it. Anchor the rhizome in place with a wire pin or toothpick pushed horizontally through the rhizome into the medium beneath.
9. Place in a warm position with bright indirect light. Avoid direct sun on new divisions; the plants have fewer roots than before and cannot yet support full light intensity.
10. Water by misting the medium surface gently for the first two weeks. Once you see new frond growth emerging, the division has established and you can resume normal bottom or top watering.

Aftercare for New Divisions

Method 2: Rhizome Cuttings

Rhizome cuttings are an alternative when you want to propagate from a specific section of the plant without fully dividing the parent, or when the rhizome has extended beyond the pot and you want to root the leading tip.

The method is similar to division but involves taking a rhizome section that may have fewer or no fronds attached, relying on dormant growth points (nodes) in the rhizome to produce new fronds after rooting.

Each rhizome cutting needs at least one visible node, the point where a frond emerges or has emerged. Nodes on Kangaroo Fern are visible as slight swellings or junction points along the rhizome.

A section with two or three nodes has a much higher success rate than a section with only one.

Step-by-Step Rhizome Cuttings

1. Select a healthy section of rhizome with two to three nodes. The section should be firm and green-brown, not soft, yellow, or brown.
2. Cut cleanly with a sterilized blade. If taking from the leading tip of a creeping rhizome, cut behind at least two nodes so the cutting has growth potential and the parent plant is not left with a bare cut end at its growing tip.
3. Dust cut ends with cinnamon or activated charcoal and allow to air-dry for 30 to 60 minutes.
4. Lay the cutting horizontally on the surface of the propagation medium. Anchor with a wire pin. Do not cover with medium.
5. Place in bright indirect light at 68 to 75 degrees F. Maintain medium moisture at barely damp. Mist rather than pour.
6. Expect visible root growth in three to five weeks and the first new frond within six to eight weeks. A cutting with no fronds will look dormant for longer than a division with fronds already attached; resist the urge to disturb it.

Method 3: Spore Propagation

Spore propagation is the natural reproduction method for all ferns, including Microsorum diversifolium.

It is slow, demanding, and best described as an extended science project rather than a practical way to expand your plant collection.

A successful spore propagation from collection to transplantable fern takes six months to a year under ideal conditions, and significantly longer if anything goes wrong.

For a plant that divides easily, spore propagation is rarely the most practical choice.

That said, it is genuinely fascinating to grow a fern from spores, and the process teaches you more about fern biology than any other propagation method.

Understanding Fern Spore Reproduction

Fern spores are not seeds. A seed contains a dormant embryo, a miniature plant with a defined structure.

A spore is a single cell that, when it lands in suitable conditions, develops into a prothallus: a tiny, flat, heart-shaped structure about the size of a small fingernail.

The prothallus is the sexual generation of the fern life cycle. It produces male and female reproductive cells.

When a male cell swims through a film of water to fertilize a female cell on the same or a nearby prothallus, the result is a fertilized egg that grows into the sporophyte, the fern plant you recognize.

This two-stage process is why spore propagation requires consistent moisture throughout: without water at the prothallus stage, fertilization cannot occur.

On a mature Kangaroo Fern, sori appear as round, regularly-spaced brown or orange dots on the undersides of fronds.

The genus name Microsorum literally means small sori. Sori start pale or green-white and mature to orange, rust, or brown.

When mature and dry, they release thousands of microscopic spores. If you see brown dots on your frond undersides, this is a sign of a healthy, mature plant, not a disease or pest problem.

Collecting Spores

1. Wait until the sori are fully mature: dark brown or orange, and dry to the touch. Pale, greenish, or wet-looking sori are not yet ripe and will produce poor germination rates.
2. Cut a single mature frond from the parent plant. Choose a frond with dense, dark sori coverage.
3. Place the frond face-down in a dry paper envelope. Fold the envelope closed and leave it in a warm, dry room for 24 to 48 hours.
4. Open the envelope carefully. You should see a fine, pale powder that has fallen from the frond. This is the spores. The frond itself can be discarded.
5. Store spores in the sealed envelope in a cool, dry place if not sowing immediately. Viability decreases over time; sow within a few weeks for best results.

Preparing the Propagation Tray

1. Use a shallow plastic container with a clear lid, or a clear plastic bag that can be sealed. Sterilization is critical at this stage: any mold or fungal growth will outcompete the tiny prothalli and kill them. Sterilize the container with a diluted bleach solution (1 part bleach to 9 parts water) and rinse thoroughly.
2. Fill the container with a sterile seed-starting or spore-propagation mix. Peat-free options include coconut coir mixed with fine perlite. Do not use standard potting compost, which contains bacteria and fungi that will overwhelm slow-germinating spores.
3. Wet the medium thoroughly until it is evenly moist throughout, then allow excess water to drain. The surface should be damp but not waterlogged.
4. If using a microwave to sterilize the medium, place the dampened medium in the container and microwave for 90 seconds. Allow to cool completely before sowing. This kills competing fungal spores in the medium.

Sowing and Germinating Spores

1. Tap the spores from the paper envelope evenly across the surface of the medium. A thin, even distribution gives better results than a thick clump; spores competing for space produce crowded, unhealthy prothalli.
2. Do not cover the spores with medium. They need light to germinate and must remain on the surface.
3. Seal the container with its lid or the plastic bag. This creates the high humidity microclimate that the germinating spores require.
4. Place in a warm location receiving bright indirect light. Avoid direct sun, which overheats the closed container. A temperature of 68 to 75 degrees F is ideal. A heat mat set to this range significantly improves germination rates.
5. Do not open the container. The sealed environment maintains humidity. If you see condensation on the lid, that is a sign the humidity level is correct. If you see no condensation and the surface looks dry, mist very lightly and reseal.

Spore Propagation: What Goes Wrong and Why

Juvenile Fronds Look Different from Adult Fronds

New plants produced from spores, and to a lesser extent from division, initially produce simple, unlobed fronds that look quite different from the deeply lobed, distinctly shaped fronds of a mature Microsorum diversifolium. This is normal and expected.

The species name diversifolium means diverse or different-shaped leaves, and the frond shape changes as the plant matures from simple juvenile forms to the characteristic lobed and fingered adult fronds.

Do not assume a young fern grown from spores is a different species because its fronds look different from the parent plant.

As the plant matures over 12 to 18 months, the adult frond form will emerge. The same transition occurs, more subtly, in divisions from very young plants.

Seasonal Timing for Propagation

Post-Propagation Care: The Critical First Month

The four weeks after propagation are the period when most failures occur.

The plant has a reduced root system relative to its frond mass and cannot yet compensate for environmental stress as effectively as an established plant.

The goal during this period is stability, not growth.

• Watering: Mist the medium surface rather than pouring water until new fronds confirm the division has rooted. The medium should be barely damp, never wet. The top of the medium should feel dry to the touch while the medium a centimeter below is slightly damp.
• Light: Bright indirect light is important for recovery, but move the plant back slightly from its normal position to reduce stress during establishment. Direct sun on an under-rooted plant desiccates fronds faster than the roots can replace moisture.
• Humidity: 50 to 60% ambient humidity. A clear plastic bag placed loosely over the pot for the first two weeks maintains this without direct misting. Remove the bag for 30 minutes each day to prevent fungal buildup.
• Temperature: 65 to 75 degrees F consistently. Avoid cold windowsills, heating vents, and air conditioning airflow during establishment.
• No fertilizer: Wait until the plant has produced at least one clearly healthy new frond before introducing any feed. Begin at quarter-strength with a balanced liquid fertilizer. A damaged or limited root system is easily burned by fertilizer.
• The success signal: A new frond emerging from the rhizome is the clearest sign that the division or cutting has established roots and is actively growing. At this point, move the plant to its permanent position and resume normal care.

Common Mistakes and How to Avoid Them

Frequently Asked Questions

How long does it take for a Kangaroo Fern division to establish?

A division made in spring with two to three healthy fronds and a good rhizome section typically produces its first new frond within four to six weeks.

By three months it will be growing steadily. Divisions with more fronds attached establish faster because they can continue photosynthesizing and supporting the root system during recovery.

Small divisions with only one frond may take eight to twelve weeks to show the first new growth.

Can I propagate Kangaroo Fern from a single frond or a leaf?

No. Unlike some succulents or certain tropical plants, ferns cannot be propagated from a frond alone. A cutting needs a section of living rhizome with at least one node.

A frond removed without attached rhizome will survive in water for a time but will not produce roots or a new plant.

My division has been in its pot for six weeks and looks the same. Has it failed?

Not necessarily. Kangaroo Fern divisions can look unchanged for several weeks while the root system quietly re-establishes below the surface.

If the existing fronds are still firm, green, and not yellowing or softening, the division is probably alive but not yet producing new growth.

Check that the rhizome is on the surface and not buried, that the medium is free-draining and not staying wet, and that the position has adequate light.

A new frond is the definitive sign of success; if none appears after eight to ten weeks and the existing fronds are also declining, the division has likely failed and you should start again.

How many pieces can I divide my Kangaroo Fern into?

A healthy, mature plant can be divided into as many sections as there are distinct frond clusters with attached rhizome of at least 3 to 4 inches.

Each section needs its own frond cluster and rhizome length to succeed.

Cutting a rhizome into many tiny sections to maximize the number of cuttings produces weak divisions with poor establishment rates.

Two to four good-sized sections from a large plant is typically more productive than six to eight very small ones.

Do I need rooting hormone for Kangaroo Fern propagation?

No. Rooting hormone is designed for stem cuttings from woody or semi-woody plants. It has no proven benefit for rhizome cuttings or divisions of epiphytic ferns.

A clean cut, correct medium, surface placement of the rhizome, and appropriate moisture are what determine success, not rooting hormone.

My spore propagation has been going for eight weeks and I see a green coating on the medium but nothing else. What is it?

A green haze or film covering the medium surface at this stage is almost certainly prothalli, the tiny heart-shaped structures that are the first stage of fern development from spores.

This is exactly what you want to see. Prothalli are flat, about 2 to 5mm at maturity, and form a dense green carpet before the fern sporophytes emerge.

The next stage, tiny fern fronds appearing from the prothallus mat, typically occurs four to twelve weeks later.

Keep the container sealed, maintain moisture, and open briefly once a week for air exchange.

Can I propagate Kangaroo Fern in water?

Rhizome sections can be suspended in water with the fronds above the surface and will sometimes produce roots, but water propagation is not reliable for this species and the transition from water roots to soil is often difficult.

Division into a free-draining medium produces more consistently successful results with less risk of loss.

Quick Reference: Propagation Methods at a Glance

Final Thoughts

Kangaroo Fern is one of the most rewarding ferns to propagate because division is genuinely easy, the results are fast, and the plant’s surface rhizome makes the process very visual and concrete.

Once you understand that Microsorum diversifolium grows differently from most plants, with its working structure on the surface rather than below it, the logic of propagation becomes clear.

The single most important thing I learned from propagating this plant is that restraint in watering makes the difference between success and failure.

New divisions do not need much water. They need air around the rhizome, barely damp medium, good indirect light, and time. Give those four things and the plant does the rest on its own.