Tree · Sapindaceae
Japanese Maple
Acer palmatum
Give it dappled shade, steady moisture, and a little shelter from wind, and the Japanese maple will reward you with color from spring right through fall.
Partial shade
Every 3–7 days
USDA 5–8
10–25 ft · 3–7.6 m
Overview
The Japanese maple is a small, slow-growing tree that grew up in the understory, so filtered light and cool roots are exactly where it feels safe and settled. There are really two shapes to know, and either one is a joy to live with. Upright forms round out into gentle little trees, while laceleaf forms mound and weep with leaves cut so fine they look like lace.
Color is the reason to fall for this tree. The palmate leaves move through red, green, bronze, and purple across the season, and come fall they blaze into red, yellow, and gold. The reddish flowers of April are so tiny they are easy to miss, so no one plants this maple for its bloom, and that is perfectly fine.
It simply asks for patience and a kind, sheltered spot, and it forgives more than you might expect. Hot afternoon sun, drying wind, and thirsty soil are what scorch the leaves, so the whole secret is dappled shade, even moisture, and a generous collar of mulch. Get the site right and it will keep you company for decades with hardly any fuss.
Care
The short version: settle it into dappled or afternoon shade out of drying wind, keep the soil evenly moist and well drained, mulch the root zone, and save any pruning for late fall to winter, and you will do just fine.
Light
Give it dappled or afternoon shade and it will feel right at home, since that is the soft, filtered light it would find under taller trees in the wild. It can take full sun in cooler climates, but in hot, dry, windy spots that sun scorches the leaves, so err toward gentleness. Deep full shade goes the other way and dulls the color while loosening the form.
Water
Keep the soil consistently moist and stay attentive through hot weather, because this tree has little patience for drought. A comfy layer of 3 to 4 inches (8 to 10 cm) of mulch under the canopy holds moisture in and keeps the roots cool. If the moisture swings in full sun, the leaf edges scorch, so steady is the whole game.
Soil
Plant it in moist, rich, well drained loam that leans slightly acidic and holds plenty of organic matter, and it will settle in happily. High-pH ground can bring on chlorosis, where the leaves yellow between the veins, so keeping the soil acidic is what keeps the foliage clean and green.
Temperature
This tree is tough across a wide span, roughly -20°F to 95°F (-29°C to 35°C), so you have real room to work with. Late frost can nip the tender spring growth, which is just one more gentle reason to tuck it out of the open and away from the wind.
Humidity
Ordinary outdoor humidity is plenty, so there is no number to chase and nothing to fret over. What truly matters is even soil moisture and shelter from wind, since it is dry wind, not dry air, that crisps the leaf edges.
Feeding
Feed it just once in spring before the leaves break, using a slow-release or balanced fertilizer, and keep a light hand. Too much feed pushes weak, fast growth and can raise the salt level enough to brown the leaf margins, so less really is more here.
Pruning
Keep pruning to a minimum and save it for late fall to mid winter, when the tree is resting and you are only taking out dead or crossing branches. Cut in spring or summer and it bleeds sap heavily, so timing matters more with this tree than most, and there is no rush.
Repotting
For a tree in a pot or trained as bonsai, repot it every 2 to 3 years, freshening the mix and trimming the roots as you go. Keep a friendly eye out for roots circling the pot, water running straight through, or foliage that scorches and stalls, since those all whisper that it has outgrown its home.
Size & spacing
Left to its own pace it reaches 10 to 25 feet (3 to 7.5 m) tall and about as wide, so give it that same room to stretch out. It grows slowly, which makes it wonderfully easy to place and forgiving if you misjudge the scale at first.
When to plant
This tree wakes up slowly and bleeds sap if you cut it at the wrong moment, so a little timing goes a long way. Plant it in spring or fall while the weather is mild, enjoy the small reddish flowers coming and going in April, and hold off on any pruning until the quiet dormant stretch from late fall into 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, in dappled shade sheltered from drying wind and late frost.
- Harvest: Inconspicuous reddish flowers in April; brilliant fall foliage color (red, yellow, bronze, purple).
Hardiness
USDA hardiness zones: 5–8
Temperature: down to -29°C
Troubleshooting
Most trouble with a Japanese maple turns up in the leaves first, whether from a spot that bakes too hard or a quieter problem down in the roots. The good news is that reading those early signs lets you catch the easy ones before they spread. Find what you are seeing below, then act while it still does the most good.
Whole branches fading and dying back on one side
This one is harder to hear, since it points to verticillium wilt, a fungus in the soil that clogs the tree's water channels and slowly cuts off whole limbs. You might notice dark streaks under the bark, but it looks so much like fusarium that a lab culture is the only way to be certain. There is no cure, so trim away the dead wood, keep the tree watered and gently fed to spur fresh growth, and never plant another susceptible tree in that same soil.
Fix:
- No cure exists; prune out dead branches and have a certified arborist assess hazardous dieback
- Support the tree with appropriate irrigation and slow-release fertilizer to encourage new growth
- Remove severely affected trees; plant only resistant species in infested soil
Sticky foliage with soft insects or waxy bumps on the bark
Don't worry, this is a common and fixable one, and two sap-sipping pests are usually to blame. Aphids gather on the soft new shoots, while scale anchor onto the bark as hard or waxy little bumps, and both leave a sticky honeydew that invites sooty mold. Rinse aphids off with a firm jet of water or a bit of insecticidal soap, treat scale with dormant oil, and keep peeking now and then so nothing sneaks up on you.
Fix:
- Hose off aphids with a strong stream of water or treat with insecticidal soap/horticultural oil
- Apply dormant horticultural oil for scale and prune out heavily infested branches
- Conserve natural predators and monitor through the growing season
Browning, curling edges on the leaves
Take heart, because this is usually just leaf scorch, the tree's way of saying it is getting too much sun, heat, and wind while the soil keeps drying out. The most exposed leaves show it first, and it deepens through hot, dry spells, yet the roots below are still perfectly fine. Water deeply and steadily, tuck 3 to 4 inches of mulch around the base, and offer a little afternoon shade or a windbreak, and the tree will thank you.
Fix:
- Water deeply and consistently to keep soil evenly moist
- Apply 3-4 inches of mulch beneath the canopy to cool roots and retain moisture
- Provide afternoon shade or relocate to a site protected from sun and wind
Toxicity
Good news for pet owners: the Japanese maple is not toxic to cats, dogs, horses, or other animals. It carries none of the wilted-leaf danger tied to red maple in horses, so you can breathe easy. A pet that nibbles the leaves might get a mild stomachache from the sheer bulk, so it is still worth gently steering them away from chewing on it.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
You can relax with a curious cat around, because this maple holds no poison for them and a small nibble does no harm. If one tucks into a big pile of leaves it might just cough them up or feel a little off for a moment, and that soon passes.
Dogs None
Dogs are safe here too, since nothing in the leaves, bark, or seeds is toxic to them. The worst you might see is a tummy that grumbles for a day after a greedy mouthful, much like any leafy plant.
Horses None
Horses can graze nearby with real peace of mind. This tree carries none of the wilted-leaf trouble tied to red maple, the kind that harms equine blood cells, which makes it a gentle, safe choice to plant beside a paddock.
Rabbits Safe
There is nothing in this plant that will poison a rabbit. Even so, offer any new greenery a little at a time so their tummies can adjust in comfort.
Livestock Safe
Cattle, goats, and sheep can browse the leaves and come to no harm. Unlike red maple, it brings none of the blood-damage worry that keeps owners of grazing animals up at night.
Birds Safe
Birds are completely safe around it, and many happily peck at the winged seeds and rest in the branches without a care.
People Safe
People have nothing to fear from this tree either. The leaves and sap even find their way into cooking and tea now and then, though it is really grown for its beauty rather than the kitchen.
Generally non-toxic, but any plant material can cause mild stomach upset if eaten in quantity; discourage pets from chewing foliage.
Varieties
There are hundreds of Japanese maple cultivars, grouped mostly by leaf shape and growth habit, and it is hard to go wrong. These are the friendly, familiar ones you are most likely to meet at the nursery.
Bloodgood
You will love how this upright cultivar keeps its deep reddish-purple palmate leaves rich and true well into summer, long after many other reds have faded.
Crimson Queen
This weeping, mounded laceleaf form drapes its finely cut red leaves over itself so softly that the whole plant seems to spill like a gentle fountain.
Sango-Kaku (Coral Bark)
An upright tree whose leaves turn a soft glowing yellow in fall, before its coral-red young bark lights up most brightly in winter.
Seiryu
A rare upright laceleaf that stays a fresh green all summer and then warms to gold and red in fall, a lovely surprise among the usual weeping threadleaf kinds.
var. dissectum / subsp. matsumurae
This is the wider threadleaf and laceleaf family, its deeply and finely cut leaves carried on a low, softly weeping mound.
How to propagate
Japanese maples are slow and a touch fussy to multiply, and the named cultivars will not come true from seed at all, so do not take it personally. Which path you choose comes down to whether you want the exact same plant or are happy with the species.
GraftingDemanding
Late winter to early spring (bench grafting onto seedling rootstock). · Several months to a year for the graft union to take and grow on.
Because named cultivars will not come true from seed, grafting is how the nursery trade keeps them faithful, and it is the route to choose when you want an exact copy. The method is bench grafting onto Acer palmatum seedling rootstock in late winter to early spring, and the fresh union then needs several months to a year to knit and grow on. It does take a skilled hand, so be patient and kind to yourself if the first tries do not take.
SeedModerate
Sow stratified seed in fall or early spring. · Seedlings establish over one to several seasons.
Seed is a friendly option for the straight species, even though each seedling comes out a little different and will not match a named parent. Sow stratified seed in fall or early spring and let the young trees settle in over one to several seasons. Do keep in mind that it self-seeds freely, enough to be listed as invasive in Virginia and DC, so gather or contain the seed where that matters.
Stem cuttingsDemanding
Early summer (softwood cuttings). · Weeks to months to root, with low success rates.
Softwood cuttings taken in early summer can root, though they are stubborn and the success rate stays low, so do not be discouraged if only a few take. Even the ones that root can take anywhere from weeks to months, which makes this a chancy path for most cultivars. When you want a true copy, grafting is the steadier and more rewarding bet.
Myths
Japanese maple leaves are dangerously poisonous to dogs and cats.
Rest easy, because Acer palmatum does not appear on the ASPCA toxic-plant lists, and like the other maples they have reviewed, it counts as non-toxic to cats and dogs. That wilted-leaf scare people remember belongs to red maple in horses, not to this tree in your pets. You can plant it happily where the animals wander.
Japanese maples must be grown in deep, full shade.
These are understory trees, so they are happiest in dappled light or a bit of afternoon shade, but pile on too much shade and the color washes out and the shape goes loose. The real danger in sun is not the light itself, it is scorch on hot, dry, windy spots where the soil bakes dry. Filtered light with steady moisture beats deep shade every time.