Tree · Moraceae
Osage Orange
Maclura pomifera
Plant it once and forget about it. The Osage orange is just about indestructible, thorns, hedge apples, and all.
Full sun
Every 7–21 days
2555–3650 days
USDA 4–9
Overview
Here's the tree that built the prairie fence. Back before barbed wire, farmers lined up the seedlings in tight rows and clipped them into a living wall that was, as the old saying went, horse-high, bull-strong, and hog-tight. It's part of the mulberry family, and those same stout thorns that made it such a good fence? They're still there arming the lower branches.
These days it's the fruit that people remember. Come fall, female trees drop heavy, yellow-green, brain-textured globes the size of a grapefruit, the famous hedge apples. They aren't an orange and you really wouldn't want to eat one, but step on one just once and you won't forget it. The little green flowers that make them are so small they slip right past you in early summer.
As a tree to actually grow? It barely asks for a thing. It takes drought, poor ground, clay, salt, and brutal cold without a fuss, grows fast, and carries some of the most rot-resistant wood in North America. The catch is the thorns and the fruit litter, which is exactly why most planted trees are thornless, fruitless male cultivars.
Care
The short version: give it full sun and pretty much any soil, water it while it's young, then just leave it alone. Once its roots are down, this is a tree that's genuinely happiest when you ignore it.
Light
Give it full sun if you want the best shape and the densest growth. It'll put up with partial sun or light shade just fine, but a tree out in the open fills in nicely, and funnily enough, it saves the worst of its thorns for those sunlit branches.
Water
Water young trees while they're rooting in, then you can back right off. Once it's established it's deeply drought tolerant and handles dry and wet ground both, so a long gap between waterings, anywhere from a week to three, is no problem at all.
Soil
This is where it really shows off. It takes poor, dry, clay, sandy, shallow rocky, even alkaline ground, coping with a pH from 6.0 to 8.5, though if you want the fastest growth it'll love rich, moist, well-drained bottomland.
Temperature
Cold and heat barely faze it. The tree rides out winters down to about -29°F (-34°C) and summers up near 100°F (38°C), and that's a big part of why it's so reliable right across the middle of the country.
Humidity
Plain outdoor air is all it needs, and there's no number for you to chase. It grows across all kinds of climates without caring one bit about how moist the air is.
Feeding
It hardly ever needs feeding. So skip the fertilizer unless growth has clearly stalled, and even then, a single balanced slow-release feed in spring does the job.
Pruning
Prune from late winter into the dormant season to clear out dead, crossing, or low thorny limbs and to shape the crown. Wear gloves and eye protection every single time, because the thorns are stout and the latex sap will irritate you.
Repotting
It's rarely grown in a pot for long, so don't sweat this one. Move a nursery seedling on once roots start circling, escaping the container, or pushing water straight through, and get it in the ground before it stalls.
Size & spacing
Expect a big tree, 30 to 60 feet (9 to 18 m) tall with an even wider spread of 35 to 50 feet (11 to 15 m). So give it plenty of open room well clear of buildings, walks, and overhead lines.
When to plant
Osage orange is a slow project, but it's one that lasts a lifetime. Start seed in late winter after a soak or a chill, put young trees out in spring once the frost is done, and keep an eye out for the small greenish flowers in June and the heavy fruit on female trees through September and October.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Late winter, after soaking seed 48 hours or cold-stratifying about 30 days.
- Plant: Spring after the last frost, or fall in mild areas.
- Harvest: Insignificant greenish flowers late spring to early summer (June); fruit ripens September to October on female trees.
Hardiness
USDA hardiness zones: 4–9
Temperature: down to -34°C
Troubleshooting
This tree hardly ever gets sick, so the real headaches are the ones it hands you, not the ones it suffers. Thorns, falling fruit, and that irritating sap cover just about every complaint. Find what you're dealing with below and sort it out before it turns into a real nuisance.
Thorns grabbing clothes and jabbing skin whenever work gets close
Those sun-lit branches carry stout woody thorns up to 1 inch (2.5 cm) long tucked into the leaf axils, and they'll tear clothes and skin the moment you get in close. So put on heavy gloves, eye protection, and thick sleeves before any pruning, and take off the low thorny branches so there's less to snag on. Got a busy spot to fill? A thornless male cultivar sidesteps the whole issue.
Fix:
- Wear heavy gloves, eye protection, and thick clothing when pruning
- Prune off low thorny branches to reduce contact
- Use thornless male cultivars in high-traffic areas
Red, irritated skin turning up after a run-in with the sap
Noticed red, itchy skin after working with the tree? That's the milky latex sap that leaks out of broken stems, leaves, and cut fruit. Give the spot a wash with soap and water, and hold off touching your eyes until your hands are clean. Next time, long sleeves and gloves keep the sap off you entirely.
Fix:
- Wash the area with soap and water
- Wear gloves and long sleeves when handling the plant or fruit
- Avoid touching the eyes or face until hands are washed
Hedge apples piling up all over the yard come fall
Every fall, mature female trees let go of dozens of hard, grapefruit-sized fruits, and they really pile up under the canopy where they'll trip you. So rake them up as they land, and keep female trees well back from walks, drives, and parking. And if all that cleanup sounds like a pain? A fruitless male cultivar skips it completely.
Fix:
- Rake and remove fallen fruit promptly
- Site female trees away from walkways, drives, and parking
- Plant male (fruitless) cultivars where litter is a concern
Toxicity
Honestly, there's not much to worry about here. Osage orange isn't on the ASPCA's toxic lists, and the bitter hedge apple, for all its scary reputation, won't poison a pet, a person, or livestock. The one thing to keep in mind is the milky sap, which can redden and irritate skin or a chewed mouth, plus a whole fruit that's big enough to choke a grazing animal.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats Safe
There's no poison here, so a cat that knocks the fruit around is totally fine. The only thing to keep half an eye on is the milky sap, which can leave a chewed mouth or paw a bit sore.
Dogs Safe
It won't poison a dog, full stop. But the fruit's tough and fibrous, so if a small dog swallows a whole one it could get stuck as a blockage, and the sap might sting a mouth that keeps chewing.
Horses Safe
Feeding studies gave the fruit the all-clear, and despite the horse apple nickname it won't hurt them. What you'd actually watch for is a whole fruit getting stuck in the throat, so it's choking you're wary of, not poison.
Rabbits Safe
Rabbits are fine around it, since there's nothing toxic in the leaves or the fruit. That said, the sticky sap can bug a tender mouth, so it isn't really a treat worth handing over.
Livestock Safe
Remember those old stories about hedge apples killing cattle? Researchers tested it and they just weren't true. The fruit poisons nothing, but a whole one can choke a cow that gulps it down, and the latex may irritate the mouth.
Birds Safe
Birds have no poison to worry about here. And honestly, most just leave the dense, hard fruit alone anyway.
People Safe
Nothing on this tree is going to poison you, and nobody eats the bitter fruit anyway. Just watch out for the milky sap when you cut or handle it, because it can redden and irritate skin or the mouth on contact.
The milky latex sap can cause mild contact dermatitis in some people; wear gloves when pruning or handling fruit. Watch for sharp thorns.
Varieties
Most of the trees you'll find sold for yards are named male clones, bred to lose the thorns and skip the fruit. These are the ones you'll want to ask for.
White Shield
It's a male selection that never sets fruit and is about as close to thornless as these cultivars get, which makes it the easy call for a tidy yard.
Wichita
A male, thornless, fruitless tree that people grow as a clean shade tree when they want all the toughness but none of the litter or thorns.
Park
Another male, thornless, fruitless clone that's picked for landscapes where dropped fruit would just be a hassle.
How to propagate
Not many trees are this easy to make more of. Osage orange grows from seed, cuttings, and root pieces without much fuss, though copying a named thornless male does mean grafting.
SeedEasy
Sow in spring after soaking seed in water about 48 hours or cold-stratifying 30 days; historically sown to grow dense hedgerow living fences. · 1-2 growing seasons to a transplantable seedling
Dig the seeds out of the soft fall fruit, then either soak them 48 hours or chill them about a month before you sow in spring. Give them plenty of light and bare mineral soil and they'll come right up, which is exactly how settlers raised whole living fences from them. Figure one to two seasons before a seedling's big enough to move.
Stem cuttingsModerate
Take softwood or greenwood cuttings in summer, or hardwood/dormant cuttings in winter. · One growing season to root
You've got two options here: soft greenwood cuttings in summer, or hardwood cuttings while the tree's dormant in winter. That dormant winter wood roots really well, usually settling in over a single growing season, and here's a nice bonus, cut from the upper thornless growth and your new plants come up thornless too.
DivisionModerate
Lift and separate root cuttings or root suckers in the dormant season. · One growing season
This tree throws up suckers and roots easily from pieces of root, so just lift and split them while it's dormant. A separated root cutting or sucker takes hold in about one growing season, so you won't be waiting long.
GraftingDemanding
Chip-bud or graft thornless male clones onto seedling rootstock in the growing season. · 1-2 seasons
Grafting's the tricky one, but it's the only sure way to copy a named thornless, fruitless male true to type. Chip-bud or graft the clone onto a seedling rootstock during the growing season, and the union takes over one to two seasons.
Myths
Stick a hedge apple or two under the couch and the spiders will pack up and leave.
It's the story you'll hear most about this tree, and it just doesn't hold up. Iowa State researchers did find that compounds pulled from the fruit can repel insects, but only at concentrations way higher than the fruit itself has. So set out whole hedge apples and the bugs won't give them a second look.
Eating a hedge apple will make people and animals seriously sick.
The fruit's bitter and nobody eats it, which is probably where the whole rumor came from, but it isn't actually poisonous. Feeding experiments finally put the old cattle-killing story to rest. The only real danger is a whole fruit choking a grazing animal, not anything toxic hiding inside.