How to Prune a Kangaroo Fern: Complete Guide

To prune a Kangaroo Fern (Microsorum diversifolium) means removing individual fronds at the base where they meet the rhizome, never cutting midway up a frond.

The rhizome is the dark green, slightly hairy, creeping stem that runs along or just above the soil surface.

This is the core of the plant: it must never be buried, never cut into during routine pruning, and only divided when you intend to propagate.

Routine pruning is minimal for this species. The plant does not need shaping, does not produce a central stem to cut back, and does not benefit from hard cutbacks.

Remove fronds only when they are damaged, yellowing, crowded, or dead.

The rest of this guide covers exactly how to do that, when to divide, how to propagate from rhizome cuttings, what the changing leaf shape means as the plant matures, and the one display method that suits this plant better than any other.

Understanding the Plant Before You Pick Up Scissors

The Rhizome: What It Is and Why It Changes Everything

The most important structural feature of Microsorum diversifolium is its creeping rhizome. This is not a root.

It is a horizontal stem, dark green, semi-wiry, lightly covered in fine hairs, that travels across and above the soil surface.

Every frond grows upward from this rhizome, and the roots grow downward from it into the growing medium below.

In its native habitat across Australia and New Zealand, the rhizome is how the plant spreads, crawling across the ground, over rocks, and up tree trunks as an epiphyte.

In a pot, the rhizome eventually fills the surface and begins spilling over the rim, which is one of the reasons this plant performs so well in hanging baskets.

The Leaf Shape Change as the Plant Matures

Kangaroo Fern fronds change shape significantly as the plant ages, and this causes frequent concern among new owners who assume something has gone wrong with their plant.

Pruning: What to Cut, What to Leave, and Why

What This Plant Does Not Need

Before covering what to cut, it is worth stating clearly what this plant does not require, because several generic fern pruning guides suggest approaches that are unnecessary or counterproductive for this species specifically.

• This plant does not need shaping. Its natural growth habit is loose and arching, with fronds emerging from the rhizome at various angles. There is no ideal shape to prune toward, and cutting healthy fronds to tidy the outline removes productive photosynthetic tissue without benefit
• It does not need hard cutbacks. Unlike some garden shrubs or herbaceous perennials, cutting this plant back hard does not stimulate bushier regrowth. It simply reduces the plant’s leaf area and slows growth
• It does not benefit from tip-clipping. Cutting the brown end off a frond leaves an unsightly stub and does not stop the rest of the frond from eventually declining. Always remove the entire frond at the base or leave it alone
• It does not need frequent pruning. A mature plant in good conditions may need only four to eight fronds removed per year

What to Remove and When

The One-Third Rule

When pruning a plant that has accumulated significant damaged or aging growth, limit removal to no more than one-third of the total frond count in a single session.

Removing more than this reduces photosynthetic capacity too sharply and slows recovery.

f a plant has more than one-third of its fronds in poor condition, spread removal across two or three sessions spaced two to three weeks apart rather than doing it all at once.

How to Cut: Technique and Tools

The Correct Cut

Follow the frond to be removed down its petiole (the stalk connecting the leaf blade to the rhizome) to the point where it emerges from the rhizome.

Cut cleanly at this point, as close to the rhizome as possible without cutting into the rhizome tissue itself. The cut should leave no visible stub.

Support the frond with your non-cutting hand rather than pulling it away from the plant.

The rhizome junctions are the growing points from which new fronds emerge; mechanical stress on these junctions from pulling can damage the rhizome surface and delay new growth from that section.

Tools

Seasonal Pruning Guide

Division: When to Do It and How

Division is the process of splitting a mature plant into two or more independently growing sections.

For Kangaroo Fern, this is both a rejuvenation technique for an overgrown plant and the most reliable propagation method.

It is best done in spring when the plant is entering active growth and new roots establish fastest.

Signs That Division Is Due

• Roots consistently emerging from drainage holes and circling beneath the pot
• The rhizome has completely covered the soil surface and is beginning to spill over the pot rim
• Water running straight through the pot on watering, indicating root mass has displaced growing medium
• Growth slowing significantly despite good light and watering
• You want additional plants for other locations or to give away

Step-by-Step Division

1. Water the plant 24 hours before dividing. A hydrated root ball separates more cleanly and the roots are less brittle
2. Remove the plant from its pot by tipping sideways and supporting the root ball. For large established plants the root ball will be dense and may require firm encouragement; squeeze plastic pots to release the sides, or tap terracotta firmly around the rim
3. Lay the root ball on a clean surface and shake away as much growing medium as possible to expose the rhizome network clearly
4. Identify natural division points: places where sections of rhizome with their own attached fronds and roots are distinguishable from adjacent sections. These natural joints are the lowest-stress cutting points
5. Using a sharp, sterilised knife, cut through the rhizome at the chosen division point. Each division must have at least two to three healthy fronds, a section of rhizome of at least 3 inches, and visible roots. A division with fronds but no roots will struggle to establish; a division with roots but no fronds has nothing to photosynthesize with
6. Inspect the roots of each division. Trim any brown, mushy, or rotten roots back to healthy white tissue using sterilised scissors. Dust cut surfaces with powdered activated charcoal
7. Pot each division in fresh growing medium with the rhizome sitting at or just above the surface. Do not bury it. Choose pots only slightly larger than the root ball of each division; oversized pots hold excess moisture that the reduced root system cannot manage
8. Water lightly and place in bright indirect light. Do not fertilise for 6 to 8 weeks. New frond production signals successful establishment, typically within 4 to 8 weeks in spring

Rhizome Cutting Propagation: A Better Method Than Full Division

Full division requires removing the entire plant from its pot and splitting the root ball, which is disruptive and involves more recovery time for both the parent and the new plants.

Rhizome cutting propagation, recommended by OurHousePlants as the easiest propagation method for this species, achieves the same result with significantly less disturbance.

A rhizome cutting is a 3 to 5 inch section of the creeping rhizome removed from the parent plant, with at least one frond growing from it.

The parent plant continues growing normally from the remaining rhizome while the cutting establishes independently as a new plant.

Step-by-Step Rhizome Cutting

1. Identify a healthy, actively growing section of rhizome at the outer edge of the plant where it meets the pot rim or extends beyond it. Outer sections are younger and establish more readily than sections from the centre of the root ball
2. Using a sharp, sterilised knife or scissors, cut a 3 to 5 inch section of rhizome that includes at least one frond in good condition. Cut cleanly through the rhizome rather than tearing; torn rhizome tissue is more vulnerable to rot
3. Allow the cut ends of the cutting to dry and callus for 20 to 30 minutes before potting. This brief drying period reduces the infection risk at the cut surface
4. Fill a small pot, 3 to 4 inches, with lightly moist growing medium. A mix of coco coir and perlite at equal parts works well for establishing cuttings
5. Lay the rhizome cutting on the surface of the medium rather than burying it. The rhizome must remain above the soil surface. Pin it down lightly if needed using a bent piece of wire or a toothpick pressed across the rhizome to keep it in contact with the medium while the roots develop downward
6. Maintain high humidity around the cutting during establishment by placing a clear plastic bag loosely over the pot or using a propagation dome. This reduces moisture loss through the single frond while new roots are developing
7. Keep in bright indirect light at 65 to 75 degrees F (18 to 24 degrees C). Check weekly for new root development by gently lifting the cutting to see if roots are beginning to grow downward into the medium
8. New frond production from the rhizome is the clearest sign of successful establishment. This typically takes 4 to 10 weeks depending on temperature and light
9. Once a second new frond is visible, remove the humidity cover and begin normal care

Spore Propagation: For the Patient and Committed

Spore propagation is possible but is not the recommended first choice for most growers.

The process is slow, taking 6 to 12 months from spore sowing to a plant of useful size, and requires consistently maintained warmth, humidity, and cleanliness throughout.

When to Harvest Spores

The round brown dots on the underside of mature fronds are sori, clusters of sporangia that produce and contain spores.

Spores are ready to harvest when the sori have darkened to deep brown or rust and some sporangia have begun to open.

Place a frond with ripe sori face-down on a piece of white paper and leave overnight in a dry room. The released spores will fall and appear as a fine rust-brown powder on the paper.

Sowing Spores

1. Sterilise a small container of fine potting medium or a 50/50 mix of peat and sand by soaking in boiling water and allowing to cool completely. Sterilisation prevents competing fungi and moss from overwhelming the slow-growing spore-derived plants
2. Sprinkle the spores thinly and as evenly as possible across the surface of the cooled, moist medium. Do not cover with additional medium
3. Cover the container with a clear plastic lid or cling film to maintain humidity and warmth
4. Place in a warm position with bright indirect light at 65 to 75 degrees F (18 to 24 degrees C). A heat mat set to 70 degrees F speeds germination significantly
5. Do not allow the medium to dry out at any point during germination. Mist the surface with distilled water using a fine spray if it begins to dry
6. After 4 to 12 weeks, a green film will develop on the medium surface. This is the gametophyte stage, heart-shaped prothalli that are not yet ferns. They require continued humidity and warmth to develop further
7. After a further 2 to 4 months in good conditions, tiny fern fronds will begin to emerge from the prothalli. At this stage, thin by removing weaker plants to give stronger ones space to develop
8. Once individual plants have 3 to 4 small fronds, carefully separate and pot into individual small containers

Hanging Baskets and Alternative Displays: The Best Way to Grow This Plant

Multiple authoritative sources identify hanging baskets as the optimal display method for Kangaroo Fern, and this is one of the most consistently underutilised recommendations for this species.

Understanding why helps explain the recommendation.

The creeping rhizome of Microsorum diversifolium travels horizontally and, once it reaches the pot rim, naturally continues over the edge and downward.

In a standard pot on a shelf or table, this trailing rhizome either has nowhere to go and becomes congested, or hangs in the air below the pot rim unsupported.

In a hanging basket or coir-lined hanging planter, the rhizome can spread naturally in all directions, root into the sides of a coir-lined basket as it travels, and eventually create the full, spherical, draping display the plant naturally produces in the wild when growing over rocks and tree trunks.

Setting Up a Hanging Basket

• A coir-lined wire hanging basket allows the rhizome to grow through the liner material and root into it, creating a more stable and naturalistic display than a solid plastic hanging pot
• Choose a basket at least 10 to 12 inches in diameter; the plant needs room to spread horizontally
• Fill with a well-draining aroid or fern mix; the same medium recommended for pot growing applies
• Set the plant so the rhizome sits at the medium surface at the centre of the basket; as it grows, the rhizome will travel outward toward the edges and eventually over the rim
• Watering a hanging basket requires more frequent monitoring than a pot on a shelf because baskets dry faster due to increased airflow around the growing medium; check moisture more frequently than you would for the same plant in a solid pot

Care After Pruning, Division, or Propagation

Troubleshooting After Pruning or Division

Common Mistakes and How to Avoid Them

Frequently Asked Questions

How often does a Kangaroo Fern need pruning?

Less often than most people expect. A healthy plant in good conditions may need only four to eight individual fronds removed per year, those that yellow naturally with age or get damaged.

There is no regular schedule to follow. Inspect the plant each time you water, which takes five seconds, and remove any frond that is more than 50% yellowed or browned at that point.

Seasonal spring tidying of any fronds that declined over winter is the one time a slightly more thorough review makes sense.

My Kangaroo Fern has a thick stem creeping across the soil and over the pot edge. Should I cut it back?

That is the rhizome, the core of the plant, and it should not be cut back during routine maintenance. The creeping rhizome is how the plant grows and spreads.

If it is trailing over the pot edge, this is a sign that the plant has outgrown its container and would benefit from either repotting into a slightly larger pot or being moved into a hanging basket where the trailing rhizome can develop naturally.

If the rhizome is very long and you want to propagate, the trailing section can be separated as a rhizome cutting as described in the propagation section.

Can I cut the rhizome to make the plant smaller?

Only during division, when each cut section is immediately potted as a new plant. Cutting the rhizome and discarding the cut sections is wasteful and stressful for the plant.

If the plant is too large for its space, division converts the excess growth into additional plants rather than destroying it.

If you genuinely do not want additional plants, moving into a hanging basket where the rhizome can trail freely often resolves space concerns without any cutting.

My plant’s new fronds look different from the original fronds. Is something wrong?

Almost certainly not. Kangaroo Fern fronds change shape throughout the plant’s life. Young plants produce simple, smooth-edged, undivided fronds.

As the plant matures, fronds become progressively more lobed and irregular, which is the adult form and the intended appearance.

The species name diversifolium refers specifically to this leaf shape variation.

The deeply lobed adult fronds are healthier and more productive than the juvenile simple fronds, so their appearance is a positive sign rather than a problem.

How long does it take for a divided Kangaroo Fern to look full again?

A division with a good root system and three or more fronds will typically look reasonable within one growing season of four to six months.

A plant divided into many small sections with minimal root mass on each division will take longer.

The fastest route to a full-looking result is to pot two or three divisions into the same container rather than into separate small pots; the combined frond count looks substantially better immediately and the plants do not compete significantly in a pot large enough for them.

Is it safe to prune a Kangaroo Fern without gloves?

Yes. Kangaroo Fern is confirmed non-toxic to humans, cats, and dogs.

The plant sap is not known to cause skin irritation in the way that, for example, Euphorbia or Ficus sap does.

Gloves are useful for keeping hands clean during repotting but are not a safety requirement for pruning this species specifically.

My rhizome cutting has been sitting in the pot for three months with no new roots. Should I give up?

Not necessarily, but check three things.

First, temperature: rhizome cuttings root very slowly below 65 degrees F and significantly faster above 70 degrees F; if your cutting has been in a cool room, a heat mat may be all that is needed.

Second, contact: the rhizome must be in contact with the medium surface, not resting above it; if it has shifted and is no longer touching the medium, pin it back down.

Third, age of the cutting: cuttings taken from very old, woody sections of central rhizome establish more slowly than those taken from younger outer sections.

If all three factors are correct and there is still no root development at 12 weeks in warm conditions, the cutting has probably not survived and a new one should be taken from a younger rhizome section.

Final Thoughts

Pruning Microsorum diversifolium is genuinely one of the simpler plant maintenance tasks.

The plant does not need much intervention, responds poorly to heavy-handed cutbacks, and asks primarily to be left alone to do what it does naturally: creep, spread, and produce increasingly characterful lobed fronds as it matures.

The three pieces of knowledge that make the most difference are: always cut at the base, never tip-clip; never bury the rhizome; and treat the changing frond shape as a sign of a healthy maturing plant rather than a problem to prune away.

With those three principles in place, everything else is detail.

When the rhizome begins spilling over the pot rim, that is the plant telling you it is ready for a hanging basket, a larger pot, or a propagation session.

Responding to that signal by dividing or moving to a hanging basket produces more plants, a better display, or both.

The trailing rhizome is not a sign that something has gone wrong; it is the plant growing as it is designed to.