Tree · Sapindaceae
Silver Maple
Acer saccharinum
Quick, tough, and eager for wet ground, the silver maple races skyward and hands you shade faster than almost any tree.
Full sun
Every 7–14 days
USDA 3–9
50–80 ft · 15.2–24.4 m
Overview
Few trees get going like a silver maple. It shoots up faster than nearly any other shade tree, and it flags its identity with the pale, silvery undersides of its deeply cut leaves, which flip and flash the instant the wind stirs them. A big native of riverbanks and floodplains, it goes by river, swamp, and water maple too, all tied to the damp ground it chases.
All that speed does come at a price worth knowing. The wood grows in weak and brittle, so limbs can snap in ice and hard wind, and the eager surface roots push up sidewalks, jam drains, and drive into sewer lines. Plant it well clear of the house, the driveway, and the utilities, though, and you sidestep nearly all of that from day one.
Turn it loose on a big, open, damp site that stumps pickier trees and it really takes off. It powers through wet soil, cold winters, and even some drought once it roots in, throws down cooling shade in a hurry, and flowers in late winter while the rest of the yard still sleeps. Pick the spot with care and it rewards you as one of the easiest, most satisfying trees to grow.
Care
The short version: hand it full sun and moist to wet, slightly acidic soil and it charges ahead on its own. It barely wants feeding, and the one job that pays you back is structural pruning while the tree is young, so its brittle wood stands up to whatever storms roll through.
Light
Plant it in full sun and it builds the strongest, fullest tree you could ask for, though it still takes partial shade in stride. Pour on the sun and the canopy fills in denser and the form comes out cleaner.
Water
This floodplain native drinks it up, thriving in moist to wet ground and shrugging off poorly drained spots that would sink other trees. Water young trees regularly until they establish, and after that they power through a dry spell on their own steam.
Soil
Silver maple takes almost any soil you throw at it, from average to wet and well-drained to soggy, since it is wonderfully adaptable. Aim it at the slightly acidic side, a pH of 5.5 to 7.0, and dodge alkaline ground, which drags the leaves toward yellow, chlorotic growth.
Temperature
This is a cold-hardy powerhouse, charging through winters down to -29°F (-34°C) and summers up to 100°F (38°C). That wide range is exactly why it thrives across so much of the country.
Humidity
Skip the humidity worries entirely, since plain outdoor air keeps it happy. What drives this tree is soil moisture at the roots, not the air drifting past the leaves.
Feeding
A silver maple rarely asks to be fed, so let a soil test lead the way. Reach for a balanced slow-release tree fertilizer in early spring only when the soil turns up short, and on alkaline ground knock back chlorosis with iron or manganese instead.
Pruning
Pruning is the job that truly moves the needle here. Get in during summer or while the tree is dormant, cut away dead, weak, crossing, or co-dominant stems and any included bark, and shape young trees early so the brittle wood is far tougher to break when a storm barrels in.
Repotting
As a landscape tree, it puts repotting almost out of the picture. Holding a young one in a nursery container? Get it planted before the roots start circling or shoving out through the drainage holes.
Size & spacing
Give it room to stretch out. A mature silver maple climbs 50 to 80 feet (15 to 24 m) tall and fans out 35 to 70 feet (11 to 21 m) wide, so set it well clear of buildings, walks, and any pipes those roots can chase down.
When to plant
Silver maple powers through zones 3 to 9, and you can plant it in spring or fall while it rests or barely stirs. It jumps the gun in bloom, flowering February to April, well before the leaves push out. Get a young one settled early and its roots dig in before the first hard season arrives.
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: February to April (flowers before leaves)
Hardiness
USDA hardiness zones: 3–9
Temperature: down to -40°C
Troubleshooting
Nearly every hiccup with a silver maple ties back to its fast, brittle growth or to soil that does not suit it, and the payoff is that the early signs jump out at you. Keep tabs on the limbs and leaves, catch trouble young, and you head off the worst of it. Match the symptom below, then move while it counts.
Limbs snapping and tearing off in storms
Silver maple races upward, and that speed leaves the wood weak and brittle, so tight V-shaped crotches with bark pinched inside rip open under ice, snow, or a hard blow. Get ahead of it by training a young tree to one strong leader with wide branch angles. Strip off any cracked or hanging limbs the moment you spot them, and bring in a certified arborist for the big ones riding overhead.
Fix:
- Remove broken and hanging limbs promptly
- Make clean cuts back to the branch collar
- Have large or hazardous limbs assessed by a certified arborist
Branches wilting and dying back
Branches that wilt fast on one side, often with olive streaks buried in the sapwood, point to verticillium wilt, a soil fungus that clogs the tree from the inside out. In a cool, wet spring anthracnose can blotch the leaves along their veins too. No spray beats the wilt, so prune the dead wood well below the trouble, keep the tree watered and driving hard, and never replant a susceptible tree where wilt has struck.
Fix:
- Prune out dead wood well below symptoms
- Water during drought and maintain tree vigor
- Do not replant susceptible species in known Verticillium sites
New leaves fading to yellow between green veins
Pale new leaves with veins that hold their green flag up chlorosis, which fires up when alkaline soil blocks the tree from grabbing enough manganese or iron. Jump on it, so test the soil pH and knock it lower where you can. Work in chelated iron or manganese, and keep lime clear of the root zone so the fresh growth greens back up fast.
Fix:
- Test and lower soil pH where feasible
- Apply chelated manganese or iron amendments
- Mulch and avoid lime near the root zone
White cottony fluff on branches, sticky leaves below
Those cottony lumps riding the undersides of the branches are the egg sacs of cottony maple scale, and the sticky honeydew they drip breeds black sooty mold underneath. On a strong tree the hit is mostly cosmetic. Track the branches through late spring and early summer, blast the crawlers with horticultural oil, and let the predator insects pile in and finish the job.
Fix:
- Apply horticultural oil during dormancy
- Spot-treat crawlers with horticultural oil
- Conserve natural predators and parasitoids
Toxicity
Great news for most homes: silver maple, like the whole maple crew, is non-toxic to cats and dogs, and it is harmless to people, who have tapped it for a light syrup for generations. Horses are the one real exception. Wilted or dried maple leaves can damage a horse's red blood cells, so keep fallen and storm-broken foliage well clear of any paddock.
Toxic to
Horses
Safe for
People · Cats · Dogs · Rabbits · Livestock · Birds
Horses Caution
Fresh leaves on the tree are fine, but wilted or dried ones are the real danger. A horse that eats them can turn dull and weak, quit its feed, and pass dark red to brown urine as its red blood cells break down. Rake up storm-downed branches and fallen leaves before they hit a paddock, and get a vet on the phone at once if a horse has gotten into them.
Cats Safe
Maples ride the ASPCA non-toxic list, so a cat that grabs a leaf has zero to worry about.
Dogs Safe
A dog can gnaw the foliage or tear around the yard with a fallen twig, all without a hint of poisoning risk.
Rabbits Safe
Rabbits face no toxicity trouble from silver maple at all.
Livestock Safe
Cattle, goats, and sheep can graze near a silver maple without a hitch, though the wilted-leaf risk that nails horses is worth keeping in mind for grazing animals.
Birds Safe
Birds pile into the canopy to nest and work the seeds with no ill effect.
People Safe
The tree poses no danger to people, and its spring sap has long been tapped for a light syrup.
Keep wilted, fallen, or storm-downed silver maple leaves and branches away from horses; wilted leaves can cause red blood cell damage (hemolytic anemia) in horses.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
United Kingdom
Animal PoisonLine: 01202 509000 (fee applies)
Australia
Animal Poisons Helpline: 1300 869 738
Varieties
Most silver maples spring straight from seed, but a couple of named picks tackle the species' worst habits head-on. These two are the ones you will most often track down.
Silver Queen
It sports a neater oval crown, drops little or no seed to rake up, and lights up yellow to close the year.
Skinneri (Skinner's Cutleaf)
It grabs the eye with deeply cut, lacy leaves and the soft, weeping sweep of its branches.
How to propagate
Starting a silver maple is a treat, mostly because its seed leaps into growth with barely a nudge. Grow it from the fresh winged seeds it flings down, or take on summer cuttings for a bit more of a challenge.
SeedEasy
Sow fresh seed in late spring to early summer as soon as samaras ripen · 2 to 4 weeks to germinate; fresh seed germinates readily without stratification
Seed is the fast lane to a new silver maple. The winged samaras ripen in late spring to early summer, and since they barely go dormant, sow them fresh the second they hit the ground. Planted right away, they burst up in 2 to 4 weeks with no cold treatment at all.
Stem cuttingsModerate
Early summer from softwood · Several weeks to root under mist
Chasing another route? Root softwood cuttings taken in early summer, standing them under mist where they strike roots over several weeks. It works, but the odds trail seed, so most growers grab the samaras first and run.
Myths
Every maple poisons dogs and cats.
Not a bit of it. The ASPCA files silver maple and the rest of the maples as non-toxic to both dogs and cats, so a pet that grabs a leaf comes through fine. The real danger runs to horses, and only from wilted or dried leaves, never the green ones riding the tree. Sweep fallen and storm-broken foliage out of any paddock and the worry is gone.