Tree · Sapindaceae
Tamukeyama Japanese Maple
Acer palmatum
It's the weeping maple with feathery red leaves that just keep looking good, spring right through fall.
Partial shade
Every 3–7 days
USDA 5–8
6–8 ft · 1.8–2.4 m
Overview
So what makes this little tree worth planting? Its leaves, mostly, not its flowers. They're a laceleaf, so deeply notched that each one looks feathery, and they come out a deep purple-red right from the start. It only gets about 6 to 8 feet (183 to 244 cm) tall, but it grows wider than that, so you end up with a low, spilling mound that looks great by a patio, in a big pot, or next to the front door.
Here's the thing that sets it apart from the other laceleaf maples: it's tough. It hangs onto its color through summer heat that turns weaker types a dull bronze, and it takes sun better than most of them do. It's a slow grower too, so it stays a sensible size for years, and those same cut leaves that glow red all season finish up scarlet to bright red in fall before they drop.
Like any Japanese maple, it does ask for a little thought about where it goes. Give it dappled light, moist soil, and a break from that brutal afternoon sun, and the delicate leaves stay fresh and colorful. Skimp on any of that and the edges go crispy, and honestly, that's the one problem you're most likely to bump into.
Care
The short version: pop it in part shade out of the hot afternoon sun, keep the soil evenly moist and a little acidic, throw down some mulch to keep the roots cool, and skip the pruning except for a bit of shaping while it's dormant.
Light
It's happiest in dappled or part shade, tucked away from the fiercest afternoon sun. In cooler spots it'll handle full sun just fine, as long as the soil stays moist. What it can't take is hot, dry, glaring sun, which is exactly what fries those fine leaves.
Water
Try to keep the soil evenly moist, which usually works out to a drink every 3 to 7 days, and more when it's really hot. Let the roots dry out and the fine leaves scorch, so it pays to stay on top of it. A layer of mulch holds the water in and keeps the roots cool, which honestly makes the whole thing easier.
Soil
Go for moist, rich, well-drained loam that's a bit on the acidic side, around a pH of 5.5 to 6.5. If the soil's too alkaline, the tree can't grab the iron it needs and the leaves turn yellow with chlorosis, so mix in loads of organic matter and stay away from limy ground.
Temperature
This maple's hardy across a big range, roughly -20°F to 95°F (-29°C to 35°C), which lines up with USDA zones 5 through 8. Cold winters? No problem, it takes them in stride. It's the hot end of that range, where sun and heat gang up, that gives the leaves a hard time.
Humidity
There's no humidity level to fuss over, since regular outdoor air is fine for it. What the leaves actually care about is damp roots and a break from drying wind, and those two matter way more than the air around them.
Feeding
Keep feeding light: one dose of balanced slow-release fertilizer in early spring does the job for the year. These maples aren't big eaters, and overdoing the fertilizer just gives you soft, floppy growth that scorches even faster, so easy does it.
Pruning
Good news: it barely needs any pruning, just a light trim now and then to keep that cascading shape. Do any cutting from late fall through midwinter while it's dormant, because if you snip in spring or summer, the cuts bleed sap.
Repotting
If it's in a pot, it'll want a bigger home every 2 to 3 years, ideally in late winter while it's resting. Roots winding around the pot, growth that's stalled, and water running straight through are all little hints it's ready to move up.
Size & spacing
Give it room to sprawl: a mature tree hits about 6 to 8 feet (183 to 244 cm) tall and spreads wider, roughly 8 to 12 feet (2.4 to 3.7 m) across. Since it grows slowly, though, it'll stay in scale for years before it ever fills that space.
When to plant
You'll plant this one once and keep it for ages, so where it goes matters way more than the exact day. Aim for spring or fall, once the hard frosts are done, since the cooler weather gives the roots a chance to settle in before summer heat or winter cold shows up.
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
Most of what goes sideways with a Japanese maple happens on the leaves, and crispy summer edges are far and away the usual suspect. The good news? Catch it early and it almost always comes down to where the tree sits and how damp its roots are. Find your issue below, then tweak the spot or the watering before it spreads.
Branches dying off with wilted leaves, usually on one side
If one side of the tree starts wilting, yellowing, and losing branches, verticillium wilt is the likely answer, a fungus in the soil that gums up the tree's water pipes from within. Peel back the bark on a wilting branch and check for dark streaks running with the grain, then get a sample off to a lab to be sure. There's no cure, unfortunately, so cut out the dead wood, keep the tree strong with good watering and feeding, and don't plant another susceptible species in that same spot.
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
Crispy, browning leaf edges when it's hot and dry
Those crunchy brown edges? That's leaf scorch, and it turns up first on whatever leaves are catching the most sun and wind. A laceleaf has such fine, cut foliage that it dries out in a hurry whenever the soil gets dry or the afternoon sun really cranks up. Give it some afternoon shade, keep the roots evenly moist, and mulch to hold water and cool the ground, and it should settle down.
Fix:
- Provide afternoon shade
- Keep soil consistently moist
- Apply mulch to retain moisture and cool roots
- Shelter from drying winds
Sticky leaves, black sooty gunk, and curled-up new growth
That sticky stuff is honeydew, and it's coming from aphids or scale sucking on the sap, with the black film on top being sooty mold that grows on the mess. Flip a few leaves over and check the stems and you'll spot them. A good blast from the hose knocks aphids off, and if it's a bigger outbreak, horticultural oil or insecticidal soap sorts it out without hurting 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
Good news if you've got pets: this maple is totally safe. Acer palmatum isn't on the ASPCA toxic list, and unlike red and silver maple, whose wilted leaves can poison horses, it doesn't carry that danger at all. So go ahead and plant it near cats, dogs, horses, and whoever else shares the yard.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats Safe
Cats are totally fine around this maple, and it's not on the ASPCA toxic list at all. A nibbled leaf won't do a thing, though if a cat scarfs a big mouthful of any greenery, you might see a bit of drool or a quick tummy upset.
Dogs Safe
Dogs have nothing to worry about here. There's no toxin in the leaves, so the worst a big chewer might get is a mild, short bout of tummy upset from eating a whole lot at once.
Horses Safe
This one gets confused with red and silver maple, whose wilted leaves can wreck a horse's red blood cells, but Japanese maple isn't tied to that at all. It's considered safe to keep around horses.
Rabbits Safe
Nothing here would hurt a rabbit. The leaves just aren't part of a normal rabbit diet, so keep any nibbling to a treat rather than letting it crowd out the hay and fresh greens.
Livestock Safe
Goats, sheep, and cattle can graze right next to a Japanese maple without any trouble, since it's got none of the maple toxins that put horses at risk.
Birds Safe
Birds are perfectly safe around it. Plenty of them will happily perch and hang out in the branches.
People Safe
It's not poisonous to people either. None of it is grown to eat, but if a curious kid tastes a leaf, there's nothing to worry about.
No special handling required; minor stomach upset is possible if pets chew large amounts of any plant material.
Varieties
Tamukeyama isn't the only weeping laceleaf out there, and you'll run into a few of its cousins at the same nurseries. Here are the ones worth having on your radar.
Tamukeyama
A tough, heat-happy weeping laceleaf whose deeply cut purple-red leaves keep their color into summer and then blaze bright red come fall.
Crimson Queen
A weeping cutleaf with finely dissected crimson leaves that stay richly colored the whole summer through.
Dissectum Atropurpureum
The old-school red-purple laceleaf, loved for the low, weeping mound it settles into.
Seiryu
The odd one out, an upright cutleaf that skips the low red mound and stays green through summer instead.
How to propagate
Thinking of making more of these? That's a tricky one. Tamukeyama only stays true when it's grafted, and that's real nursery work, not something you'll pull off in the backyard.
GraftingDemanding
Late winter to early spring while dormant. · 1-2 years for the graft union to establish.
Tamukeyama's a grafted cultivar, so you can't grow it true from seed or start it from a cutting, sad to say. What a nursery does is splice a bud onto Acer palmatum seedling rootstock during winter dormancy, roughly late winter into early spring, and that takes a seriously steady hand. From there, the graft needs a year or two to really knit together before the young tree's ready to go in the ground.
Myths
Japanese maples are poisonous to cats and dogs.
Nope. Acer palmatum isn't on the ASPCA toxic list, so it's safe around cats and dogs. The poisoning people mix it up with is really a red maple problem, since that's a whole different species and it's the wilted red maple leaves that trouble horses, not this tree.
Japanese maples have to grow in full shade.
Not true. They're happy anywhere from full sun to part shade. In a hot climate what they really want is afternoon shade and steady moisture so the fine leaves don't scorch, and that's a far cry from the deep, dark shade the myth talks about.