Tree · Sapindaceae
Sugar Maple
Acer saccharum
Give it moisture-rich soil and elbow room, and a sugar maple pays you back with shade all summer and knockout fall color.
Full sun
Every 7–14 days
USDA 3–8
39–79 ft · 12–24 m
Overview
Ever wondered what's behind those postcard New England autumns? A lot of it is the sugar maple, the same tree that gives us syrup. It's in no hurry, slowly filling out into a broad, rounded shade tree that can hit 80 feet (24 m), with a thick trunk and a canopy that keeps things cool all summer. Then fall shows up and the leaves go orange, red, and gold, which is really why folks plant it.
Here's the thing: this tree likes it cold. It's comfortable in zones 3 through 8 and handles winters down to -40°F (-40°C) just fine, but it's got no love for the heat, road salt, and packed-down soil of a tight city lot. Give it deep, fertile, evenly moist ground with room for its roots to wander, and it'll stick around for generations.
One catch worth knowing up front: it takes its time. Sugar maple grows slow and lives a long while, so you're planting it for years down the road, not for a quick payoff. And here's the fun part, its sap turns sweet in late winter, which is exactly why sugarhouses up north tap it every spring to make maple syrup.
Care
The short version: pop it in full sun to part shade, in deep, fertile soil that stays moist but drains well, give it about an inch of water a week when it's hot or dry, and keep it away from pavement and road salt.
Light
Sugar maple loves full sun, but it'll take partial shade too, especially while it's young. More sun means fuller fall color and a denser crown, though even a half day of light is enough to grow a happy, healthy tree.
Water
Keep the soil deep and evenly moist, watering somewhere around every 7 to 14 days when the rain doesn't do it for you. When it gets really hot or dry, an established tree wants about an inch of water a week, which keeps the leaf scorch this species is prone to from showing up.
Soil
Go for deep, fertile loam that holds moisture but still drains and has plenty of organic matter in it. A pH somewhere from 5.5 to 7.0, slightly acidic to neutral, is what it likes, and the one thing it won't put up with is compacted, soggy ground.
Temperature
This one's tough in the cold, happy anywhere from -40°F to 95°F (-40°C to 35°C). It's a natural up north and has a rougher time where summers drag on hot.
Humidity
No need to fuss over humidity, since regular outdoor air is all it wants. What really matters? Airflow and steady soil moisture, way more than anything happening in the air.
Feeding
Feed it in early spring with a balanced slow-release tree fertilizer, and let a soil test tell you how much it actually needs instead of guessing. A ring of mulch around the drip line does its own quiet feeding as it breaks down.
Pruning
Only prune in summer or when it's fully dormant to clear out dead, damaged, or crossing branches, because a maple cut in late winter or early spring bleeds sap like crazy. And wipe your tools between cuts with 10 percent bleach or 70 percent alcohol so you're not spreading anything from branch to branch.
Repotting
Since this is a landscape tree and not a pot plant, repotting basically never comes up. Just check nursery or potted stock for roots circling the trunk flare or a top that's lagging behind a crowded root ball, and gently free those roots before it goes in the ground.
Size & spacing
Give it plenty of space, seriously. It gets 40 to 80 feet (12 to 24 m) tall and spreads 30 to 60 feet (9 to 18 m) wide, so keep it well clear of the house, the driveway, and any power lines.
When to plant
Planting time is spring or fall, while it's still cool out and the roots can settle before any stress rolls in. Those little greenish-yellow flowers show up in April, right before or with the leaves, but let's be honest, the main event is fall, when the whole canopy lights up red, orange, and gold.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Spring or fall
- Harvest: Inconspicuous greenish-yellow flowers in April before or with the leaves; brilliant red, orange, and yellow fall color
Hardiness
USDA hardiness zones: 3–8
Temperature: down to -40°C
Troubleshooting
Good news is, sugar maple usually tells you something's off through its leaves first, whether that's heat, a soil fungus, or a wet spring. Once you can read those signs, it's easy to tell a little cosmetic thing from a real problem. So take a look below and match up what you're seeing before you grab a sprayer.
Just one side wilting while the rest looks healthy
When one branch or a whole side wilts and dies back but everything else looks fine, it's probably Verticillium wilt, a soil fungus that clogs up the tree's water pipes from the inside. Peel a bit of bark off a wilting branch and look for green or brown streaks, then get a sample to a lab, since most maple diseases look the same to the naked eye. There's no cure, unfortunately, so keep cutting out the dead wood and keep the tree watered and fed to give it more good years.
Fix:
- There is no cure; prune out dead branches as they appear
- Water about one inch per week and fertilize based on a soil test to prolong tree life
- Mulch around the drip line and sanitize pruning tools with 10 percent bleach or 70 percent alcohol between cuts
Crispy brown leaf edges when it's hot and dry
See brown, crispy edges and dead patches between the veins during a hot dry spell? That's leaf scorch, and it just means the roots can't grab water fast enough to keep up. Salty soil, packed ground, or a tight root zone near pavement makes it worse. Water an established tree about an inch a week through the heat, and toss some mulch over the roots to help hold the moisture.
Fix:
- Water established trees with about one inch of irrigation per week during heat and drought
- Mulch over the root zone to conserve moisture and moderate soil temperature
- Avoid salt accumulation and soil contaminants around the roots
Shiny black spots with yellow halos come late summer
Those thick, shiny black splotches with yellow around them are tar spot, a leaf fungus that looks way scarier than it actually is. Rake up and toss the fallen leaves every fall, since that's where the fungus hangs out waiting to come back. On a small tree you could spray a copper fungicide at leaf-out, but honestly, for most maples it's not worth it.
Fix:
- Rake up and destroy fallen leaves where the fungus overwinters
- If desired on small trees, apply a copper-based fungicide, mancozeb, or triadimefon three times at two-week intervals starting at spring leaf unfurl
Browned leaves and dead buds after a soggy spring
A long, cool, soggy spring is the setup for anthracnose, a fungus that browns leaves along the veins, kills buds, and leaves behind twisted twig dieback. Rake up and get rid of the infected leaves so the spores don't stick around for next year. Better airflow and drier foliage go a long way toward keeping it from settling in.
Fix:
- Rake and destroy fallen infected leaves
- On valuable small trees, spray a copper-based fungicide, mancozeb, or chlorothalonil three times at two-week intervals from spring leaf emergence
Toxicity
Worried about pets or kids around it? Don't be. Sugar maple is safe for people, pets, and livestock, and its boiled-down sap is literally what maple syrup is made from. That scary wilted-leaf poisoning you might've heard about comes from red and silver maple, not this tree.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Cats are totally fine. If one chews on a fallen leaf, no big deal.
Dogs None
Dogs have nothing to worry about either, since the leaves, bark, and twigs won't bother them at all.
Horses None
Horses are safe with sugar maple. That red-blood-cell poisoning you hear about comes from wilted red and silver maple leaves, not this tree.
Rabbits None
Rabbits can munch the leaves without any problem.
Livestock None
Cattle, goats, and sheep can graze right near a sugar maple and be perfectly fine.
Birds None
Birds nest and feed up in the canopy no problem, and the seeds are food for lots of other wildlife.
People None
People are safe too, and here's the treat: boil the sap down and you've got maple syrup, so a bit of this tree ends up on the breakfast table.
Non-toxic to cats and dogs. Note that it is the related red maple (Acer rubrum) whose wilted leaves are notoriously toxic to horses; sugar maple is not the species classically implicated, but as a general precaution wilted maple leaves of any species are best kept away from horses.
Varieties
Most sugar maples at the nursery are named cultivars, picked for tougher leaves and better fall color. These are the ones worth asking for by name.
Green Mountain
It shrugs off heat and drought, keeps a dense oval crown, and turns a nice orange-red once fall hits.
Legacy
This one's a strong grower that resists scorch, with thick, glossy leaves that don't tear easily and handle drought.
Fall Fiesta
A tough, quick-to-settle tree that gives you reliable yellow-orange to red fall color and hangs onto its leaves later than most.
How to propagate
Want to grow one from seed? You can, as long as you give it a cold spell first. The named types, though, only stay true if they're grafted.
SeedModerate
Sow outdoors in fall or after 60-90 days of cold, moist stratification before spring sowing · 1 to 2 growing seasons
Sugar maple seed won't sprout until it's been through some cold, so either sow it outside in fall or give it 60 to 90 days of cold, moist stratification before you sow in spring. Figure a young tree will take 1 to 2 growing seasons to really settle in. If you'd rather, you can also start it from layering or stem cuttings.
GraftingDemanding
Late winter (bench graft) or summer (budding) · 1 to 2 seasons
Named types like Green Mountain and Legacy won't grow true from seed, so growers graft or bud them onto seedling rootstock instead. Bench grafting happens in late winter and budding in summer, and the union takes about 1 to 2 seasons to knit together. It really does take a steady hand, which is why it's the tricky route.
Myths
Every maple, sugar maple too, is deadly poison for horses.
Nope, that's really about red maple and silver maple, whose wilted leaves can wreck a horse's red blood cells. Sugar maple isn't the problem here, and instead of being poisonous, it's the very tree we tap for maple syrup.