One of the questions I receive regularly at TOMs FLOWer CLUB is whether Brachychiton bidwillii, commonly known as the Little Kurrajong, can be propagated from stem cuttings.

The short answer is yes - but with significant limitations.

Although stem cuttings can occasionally produce roots under carefully controlled conditions, they rarely develop into the characteristic plants that collectors admire. In almost every case, seed propagation remains the superior method, producing healthier plants, stronger root systems and, most importantly, the distinctive swollen trunk that makes this remarkable Australian species so desirable.

Understanding why this happens requires looking beyond simple propagation techniques and appreciating how this fascinating tree grows in nature.

Meet Brachychiton bidwillii

Native to Queensland, Australia, Brachychiton bidwillii belongs to the Malvaceae family, together with hibiscus, baobabs and cotton.

Unlike many ornamental trees, this species combines several remarkable characteristics:

• spectacular crimson-red bell-shaped flowers
• a naturally swollen trunk base
• excellent drought tolerance
• attractive lobed foliage
• exceptional longevity

Young plants already hint at the sculptural form they will eventually develop, making them increasingly popular among collectors of caudiciforms, xerophytic plants and unusual Australian species.

Why Collectors Love This Species

Many people initially buy Brachychiton bidwillii because of its brilliant flowers.

Collectors, however, often become fascinated by something else entirely—the gradual development of its thickened trunk.

Unlike artificially swollen bonsai or grafted specimens, the expanding base develops naturally as the plant matures. It serves as a water storage organ, allowing the tree to survive Australia's seasonal droughts.

Watching this transformation over many years is one of the real pleasures of growing the species.

At TOMs FLOWer CLUB, we consider this slow evolution part of the plant's beauty rather than something to accelerate.

Why Seedlings Develop Better Than Cuttings

This is perhaps the most important concept to understand.

A seedling begins life with a tiny embryo programmed to produce a taproot almost immediately after germination.

That taproot doesn't simply anchor the plant.

It becomes the structural foundation from which the characteristic swollen trunk—or caudex-like base—gradually develops.

Every season, the plant stores carbohydrates and water within this expanding tissue.

The process is remarkably efficient because the entire architecture of the young plant evolved for exactly this purpose.

A cutting begins life very differently.

Instead of producing a true taproot, it creates adventitious roots from stem tissue. These roots function perfectly well for water uptake but rarely recreate the same structural growth pattern established by seedlings.

The result?

Many rooted cuttings remain perfectly healthy but never develop the attractive basal swelling that makes mature Brachychiton bidwillii so distinctive.

Is Rooting Cuttings Impossible?

Not at all.

It is simply unreliable.

Professional nurseries generally avoid propagating Brachychiton bidwillii from cuttings because the success rate is low, rooting is slow, and the resulting plants often lack the qualities customers expect.

Even under excellent conditions many cuttings fail to root altogether.

Others root successfully but remain comparatively weak or develop irregular growth.

For commercial growers, this makes little economic sense.

For collectors, it often results in years of disappointment.

If You Want to Try Anyway

Plant collecting has always involved experimentation.

If you already own a mature specimen, there is certainly no harm in trying a few cuttings.

The best material consists of semi-hardwood shoots taken during late spring or early summer when active growth has begun but stems have started to firm.

Cuttings approximately 10–15 cm long generally perform best.

A rooting hormone containing IBA (Indole-3-butyric acid) can improve rooting percentages.

Equally important is the growing medium.

Dense composts hold too much moisture and encourage fungal problems.

Instead, use an extremely open substrate consisting mainly of perlite combined with coarse sand, pumice or a small proportion of coconut fibre.

Bottom heat between 24 and 28°C greatly improves the chances of root initiation.

Humidity should remain high enough to reduce water loss from the leaves, but good ventilation is equally important to prevent rot.

Patience is essential.

Root formation often requires many weeks.

Some cuttings never respond despite ideal conditions.

Others appear alive for months before finally collapsing.

This unpredictability explains why experienced growers generally reserve cutting propagation for experimentation rather than production.

Why Seed Propagation Produces Better Plants

Fresh seed remains the gold standard.

One advantage many beginners underestimate is how quickly seedlings establish.

Under warm conditions with fresh seed, germination is usually excellent.

Young plants soon produce vigorous taproots, followed by surprisingly rapid top growth.

More importantly, each seedling develops its own unique trunk character from the very beginning.

Over time this creates stronger, better-balanced plants with superior long-term appearance.

At TOMs FLOWer CLUB, virtually all our Brachychiton bidwillii are grown from carefully selected seed for precisely this reason.

We believe quality begins beneath the soil surface.

Growing for Decades, Not Just Seasons

One lesson every collector eventually learns is that plants should be judged over years rather than months.

Rapid growth achieved through excessive fertiliser rarely produces superior specimens.

Instead, slow, balanced cultivation allows stronger wood, healthier roots and more natural proportions.

Our cultivation philosophy at TOMs FLOWer CLUB follows exactly this principle.

We grow plants organically whenever possible, avoid excessive fertilisation and use our own free-draining substrate mixtures developed through years of growing caudiciforms, succulents and orchids.

Healthy root systems always come before rapid top growth.

For long-lived species such as Brachychiton bidwillii, this patience is richly rewarded.

Should Collectors Ever Buy a Cutting-Grown Plant?

It depends entirely on your expectations.

If you simply enjoy the foliage and eventually hope to see flowers, a rooted cutting may provide years of enjoyment.

However, if your goal is to cultivate an outstanding collector's specimen with a beautifully developed swollen trunk, seed-grown plants remain unquestionably superior.

That is why serious collectors consistently seek seed-raised material.

The difference becomes increasingly obvious with age.

Final Thoughts

Every plant teaches us something about evolution.

In the case of Brachychiton bidwillii, it teaches patience.

Nature designed this remarkable Australian tree to begin life from seed, establish a deep taproot and slowly build the water-storing trunk that enables survival in an unpredictable climate.

While cuttings can occasionally root, they rarely reproduce this remarkable architecture.

For anyone hoping to grow a truly exceptional specimen, my recommendation remains unchanged after many years of cultivation:

Experiment with cuttings if curiosity inspires you.

But grow your future collection from seed.

The results may take a little longer to appreciate—but they are almost always worth the wait.

At TOMs FLOWer CLUB, this philosophy guides everything we grow: quality before quantity, healthy roots before rapid growth, and plants cultivated to thrive for years rather than merely to sell today.

Frequently Asked Questions

Can Brachychiton bidwillii be propagated from cuttings?

Yes, but rooting is inconsistent and many cuttings never develop the characteristic swollen trunk that seed-grown plants produce naturally.

Why don't cuttings form the same caudex?

Cuttings develop adventitious roots rather than the true taproot produced by seedlings. This alters the plant's natural growth architecture and usually limits basal thickening.

What is the best time to take cuttings?

Late spring to early summer, using semi-hardwood shoots approximately 10–15 cm long.

Does rooting hormone help?

Yes. An IBA-based rooting hormone can improve rooting success, although it cannot guarantee successful propagation.

What is the best propagation method?

Fresh seed remains the most reliable method for producing vigorous, attractive collector-quality plants with well-developed swollen trunks.