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Trident Maple
Acer buergerianum
Care level: Easy
Trident Maple is one of the most popular deciduous bonsai species after Japanese Maple, valued for small, three-lobed leaves that reduce well, vigorous back-budding, and bark that flakes attractively with age to reveal patches of orange-brown beneath. Native to China, Japan, and Taiwan, it's forgiving of aggressive pruning and root work in a way few other trees are, which has made it a favourite both for beginners and for some of the most dramatic root-over-rock bonsai in the world.
Acer buergerianum 'Mino Yatsubusa'Acer buergerianum var. formosanum
Light
Full sun to light shade; more sun helps develop compact growth and good autumn colour.
Water
Keep the soil evenly moist during the growing season; let the surface dry slightly once the tree is dormant in winter.
Humidity
Not a controllable factor outdoors; adapts well to a range of humidity levels.
Soil
Any well-draining bonsai soil; Trident Maple isn't particular about soil pH.
Temperature
Fully hardy. Protect the roots of a potted tree from prolonged hard frost.
Size
A tree of 7.5-10.5m in the ground; kept small as a bonsai by pruning.
Growth speed
Medium
Signature technique
In root-over-rock, young roots are wrapped against a stone and buried, left for several years to thicken and grip it, then gradually exposed as the soil is washed away. Trident Maple is the usual choice because its roots take that repeated disturbance in their stride.
Care by Season
Spring
Vigorous new growth begins; a good time for structural pruning before leaves fully open, since cuts heal quickly.
Summer
Pinch new shoots back to one or two leaf pairs throughout the season to build fine ramification; water regularly as soil dries faster in heat.
Autumn
Leaves turn orange to red before dropping; older bark may begin flaking to reveal patches of lighter orange-brown bark beneath.
Winter
Fully deciduous and hardy; a good season for root pruning and repotting while the tree is dormant, and for wiring bare branches.
Growing & Maintenance
Soil and pot
Any well-draining bonsai soil. It is not particular about pH.
Repotting
In winter, while the tree is dormant. That is also the moment to prune the roots.
Pruning
Do structural pruning in early spring, before the leaves fully open. Pinch new shoots back to one or two leaf pairs through the season.
Pests & Diseases
Common problems
One branch wilting suddenly
Most likely cause: Verticillium wilt.
What to do: Prune out the affected branch well below the visible damage.
Long shoots and large leaves
Most likely cause: No pinching, or too little sun.
What to do: Pinch new shoots back to one or two leaf pairs and give the tree more sun.
Curled, sticky young leaves
Most likely cause: Aphids.
What to do: Rinse them off with a strong spray of water.
Small bumps on the twigs
Most likely cause: Scale insects.
What to do: Scrape off what you can see and treat with horticultural oil.
Bark cracking and flaking in patches
Most likely cause: Normal on a maturing tree.
What to do: Nothing to do. It is a prized feature.
Pests & Diseases
Aphids
Signs: Clusters of small insects on new shoots and a sticky residue (honeydew) on leaves below.
Treatment: Rinse off with a strong spray of water or apply insecticidal soap, repeating as needed.
Verticillium wilt
Signs: Sudden wilting or dieback of individual branches, sometimes with staining visible in the wood beneath the bark.
Treatment: Prune out affected branches well below the visible damage and disinfect tools between cuts; there's no cure once it's systemic.
Scale insects
Signs: Small brown or grey bumps along stems and branches, often with sticky honeydew nearby.
Treatment: Scrape off visible scale and treat with horticultural oil, repeating as needed.
FAQ
Can I keep a Trident Maple bonsai indoors?
No, not long-term. It's a deciduous tree that needs real seasonal changes, including winter dormancy with a period of cold, to stay healthy; indoors it won't get the dormancy it needs and will weaken over time.
Why does the bark on my Trident Maple look like it's peeling?
That's normal, and even desirable. As Trident Maple matures, its bark naturally cracks and flakes in patches, revealing lighter orange-brown bark underneath, a texture bonsai growers value on older trunks.
How often should I water a Trident Maple bonsai?
Often enough to keep the soil evenly moist in the growing season. In winter, when it is dormant, let the surface dry slightly between waterings.
How much sun does a Trident Maple need?
Full sun to light shade. More sun gives compact growth and good autumn colour.
What colour does a Trident Maple turn in autumn?
Orange to red, sometimes yellow. The leaves then drop and the tree rests for winter.
When should I prune a Trident Maple bonsai?
Do structural pruning in early spring, before the leaves have fully opened. New shoots are then pinched back all season to build fine branching.
