Tree · Sapindaceae
Tamukeyama Japanese Maple
Acer palmatum
The weeping laceleaf that gives a courtyard its quiet centerpiece, red from spring to a glowing fall.
Partial shade
Every 3–7 days
USDA 5–8
6–8 ft · 1.8–2.4 m
Overview
Some trees make a statement, and the Tamukeyama Japanese maple makes it softly. It is grown for foliage rather than bloom, a laceleaf so finely cut it reads as a soft, feathery veil in a deep purple-red. At just 6 to 8 feet (183 to 244 cm) tall and wider than it is high, it settles into a low, cascading mound that gives a courtyard its focal point, softens the corner of a patio, or frames an entry with a note of calm.
What makes it such a dependable piece in a planting is that it looks composed all season long. It keeps its rich color through the heat of summer while lesser laceleafs slump to bronze, and its slow, unhurried growth means it stays in proportion to a small space for years rather than outgrowing it. Come autumn the whole mound turns scarlet to bright red, giving the garden its last, brightest moment before winter.
The trick to enjoying it is choosing its spot with a little intention. Set where it catches gentle, dappled light with shelter from the fierce afternoon sun, in soil kept quietly moist, and it repays you with foliage that always looks effortless. Get the placement wrong, in a hot, exposed corner, and the edges brown, which is the one thing that undoes an otherwise polished look.
Care
The short version: give it a part-shade spot away from hot afternoon sun, soil kept evenly moist and lightly acidic, a tidy layer of mulch over cool roots, and no more than a light dormant-season trim to hold its shape.
Light
Give it dappled or part shade, the kind of soft, filtered light that also happens to flatter its color, with cover from the harshest afternoon sun. In cooler regions it takes full sun gracefully as long as the soil stays moist. Hot, dry, direct sun is the one exposure to avoid, since it scorches the fine leaves.
Water
Keep the soil evenly moist, which usually means watering every 3 to 7 days and more through a heat wave. The fine foliage browns if the roots run dry, so a neat layer of mulch earns its place, holding moisture and keeping the roots cool right through the warm months.
Soil
Plant it in rich, moist, well-drained loam on the acidic side, at a pH of 5.5 to 6.5. Soil that runs too alkaline locks away iron and dulls the leaves to a yellow chlorosis, so work in plenty of organic matter and steer clear of limy ground.
Temperature
It is hardy across a wide sweep, from about -20°F to 95°F (-29°C to 35°C), spanning USDA zones 5 through 8. Deep winter cold barely registers. It is the warm end of the range, where heat and sun press on the foliage, that calls for the shelter of a well-chosen spot.
Humidity
There is no humidity figure to manage here, since ordinary outdoor air suits it. What matters to the leaves is moist roots and a spot out of drying wind, both of which do far more good than anything you could do for the air.
Feeding
Feed it lightly, a single helping of balanced slow-release fertilizer in early spring each year. Japanese maples ask for little, and heavy feeding only forces soft growth that scorches more easily, so a restrained hand keeps the tree looking its best.
Pruning
It wants very little pruning, just a light hand to preserve the cascading silhouette that makes it worth planting. Do any shaping from late fall through midwinter while it is dormant, since a cut made in spring or summer bleeds sap.
Repotting
A potted specimen wants a larger container every 2 to 3 years, best done in late winter while the tree rests. Roots circling the pot, growth that stalls, and water slipping straight through are the cues that it is time to size up.
Size & spacing
Plan for a mature height of 6 to 8 feet (183 to 244 cm) and a broader spread of 8 to 12 feet (2.4 to 3.7 m), and give it room to spill without crowding a path or a doorway. Its slow growth means it holds that graceful scale for years.
When to plant
This is a tree you place once and live alongside for decades, so the spot deserves more thought than the date. Plant it in spring or fall, once hard frost has passed, when the mild weather lets the roots settle and the tree eases into its new setting before the extremes of summer or winter.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Spring or fall, after frost danger has passed.
- Harvest: Insignificant reddish-purple flowers in April; grown for foliage with scarlet to bright red fall color.
Hardiness
USDA hardiness zones: 5–8
Temperature: down to -29°C
Troubleshooting
For all its poise, this maple wears its troubles on its leaves, and summer scorch along the edges is the usual disruption to its good looks. Most issues trace back to the same two things, the exposure of its spot and how moist the roots stay. Match what you see below, then adjust the placement or the watering before the look suffers.
One-sided dieback with wilting, fading leaves
When one side of the tree fades, wilts, and loses branches, the cause is often verticillium wilt, a soil-borne fungus that clogs the wood from within. Ease the bark from a wilting branch to look for dark streaks along the grain, then send a sample to a diagnostic lab for a firm answer. There is no cure, so remove the dead wood, keep the tree vigorous with steady water and feeding, and choose a resistant plant if you replant that ground.
Fix:
- Prune out dead and dying wood
- Maintain vigor with proper irrigation and slow-release fertilizer
- Consult a certified arborist for hazard assessment
- Remove severely affected plants and avoid replanting susceptible species in infested soil
Browning leaf edges that dull the look in summer heat
Brown, brittle edges are leaf scorch, showing first on the leaves that face the most sun and wind. A laceleaf carries such fine foliage that it dries out quickly once the soil goes dry or the afternoon sun turns harsh. Ease the strain with a shadier afternoon spot, roots kept evenly moist, and a layer of mulch to cool the ground and hold water.
Fix:
- Provide afternoon shade
- Keep soil consistently moist
- Apply mulch to retain moisture and cool roots
- Shelter from drying winds
Sticky leaves and a sooty black film
A sticky sheen on the leaves is honeydew from aphids or scale at the sap, and the black film that follows is sooty mold growing on it. Check the undersides of the leaves and along the stems to find the culprit. A firm jet of water clears aphids, and horticultural oil or insecticidal soap handles a heavier infestation without harming the tree.
Fix:
- Hose off aphids with a strong stream of water
- Treat heavy infestations with horticultural oil or insecticidal soap
- Encourage beneficial predators
Toxicity
There is a quiet reassurance to living with this tree: it is safe around animals. Acer palmatum does not appear on ASPCA toxic-plant lists, and unlike red and silver maple, whose wilted leaves can poison horses, it brings no such worry into the garden. It can share space with cats, dogs, horses, and the rest of the household.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats Safe
Cats can share a room or a garden with this maple in complete ease, as it sits off the ASPCA toxic list. A nibbled leaf means nothing, though a large mouthful of any plant may bring a little drooling or a brief upset stomach.
Dogs Safe
Dogs are free to wander past it without concern. The leaves hold no toxin, so the most a determined chewer risks is a mild, passing stomach upset after eating a good many at once.
Horses Safe
Where red and silver maple threaten horses, their wilted leaves able to destroy red blood cells, Japanese maple carries no such link. It is regarded as safe to keep near horses.
Rabbits Safe
Nothing in this tree would harm a rabbit. The leaves are not part of a natural diet, though, so let any nibbling stay occasional rather than a stand-in for hay and fresh greens.
Livestock Safe
Goats, sheep, and cattle can graze nearby in safety, since the tree holds none of the maple toxins that endanger horses.
Birds Safe
Birds face no danger from it at all. Many will settle in to perch and shelter among its trailing branches.
People Safe
It poses no danger to people. Nothing on the tree is grown to be eaten, yet a child who tastes a leaf comes to no harm.
No special handling required; minor stomach upset is possible if pets chew large amounts of any plant material.
Varieties
Tamukeyama keeps company with a small circle of weeping laceleaf maples, and a few of them turn up beside it on the nursery bench. These are the relatives worth weighing when you are choosing a piece for the garden.
Tamukeyama
A heat-tolerant, strong-growing weeping laceleaf whose deeply cut purple-red foliage stays saturated into summer, then shifts to bright red for fall.
Crimson Queen
A weeping cutleaf whose finely dissected crimson foliage holds its depth of color from spring through summer.
Dissectum Atropurpureum
The time-honored red-purple laceleaf, chosen for the low, weeping mound it makes in a bed.
Seiryu
An upright cutleaf that stands apart from the low red mounders, keeping its foliage green all summer.
How to propagate
Multiplying this maple is a job for the nursery, not the home garden. Tamukeyama holds its identity only when it is grafted, a piece of skilled craft rather than a casual project.
GraftingDemanding
Late winter to early spring while dormant. · 1-2 years for the graft union to establish.
Tamukeyama is a grafted cultivar, so it cannot be raised true from seed or a cutting. A nursery joins a chosen scion to Acer palmatum seedling rootstock through the dormant weeks of late winter and early spring, work that rewards a practiced, patient hand. The union then takes a year or two to bond securely before the young tree is ready to take its place in the garden.
Myths
Japanese maples are poisonous to cats and dogs.
There is nothing to fear here. Acer palmatum is not on the ASPCA toxic list and is safe around cats and dogs. The poisoning people picture actually belongs to red maple, a separate species, and it is that tree whose wilted leaves put horses at risk, not this one.
Japanese maples must be grown in full shade.
Not so. These maples take anything from full sun to part shade. In a warm climate the genuine need is afternoon shade and steady moisture to keep the fine leaves from scorching, a world away from the deep, dark shade the myth imagines.