Tree · Rosaceae
Apple
Malus domestica
Give it full sun, a pollination partner, and a yearly prune, and an apple tree feeds you for decades.
Full sun
Every 7–14 days
USDA 3–8
8–30 ft · 2.4–9 m
Overview
An apple tree is something you plant for the long run. It sits in the rose family and has been crossed and grafted for thousands of years into the named varieties you see in the produce aisle. Set one in good ground and it can carry fruit for 30 years or more, becoming a permanent shape in the yard rather than a single season's project.
The thing that surprises most first-time growers is pollination. Most apple cultivars can't fertilize their own flowers, so a single tree blooms gorgeously and then sets almost no fruit. A real crop needs a second, compatible variety flowering at the same moment within reach of the bees, or a crabapple stepping in nearby. Count on two trees from the start, or confirm a neighbor's tree already does the job.
One last factor settles whether an apple will even thrive where you are: chill hours. The tree needs a run of winter cold to break dormancy and flower come spring, and each cultivar asks for a different amount. Pair the variety to your zone, give it sun and a yearly prune, and what's left is the patient business of letting a tree fill out.
Care
The short version: full sun all day, deep well-drained soil near a pH of 6.0 to 7.0, and a second compatible variety close by for pollination. Water young trees often, prune every winter, and hold back on nitrogen so the new growth stays firm.
Light
An apple tree asks for full sun, meaning 6 or more hours of direct light each day, and it puts up with no real shade. Sun drives the flower buds and ripens the fruit, so a shaded tree turns out weak growth, more disease, and a thin crop.
Water
Young and freshly planted trees want steady water while their roots reach out, getting a deep soak every 7 to 14 days through dry spells. A settled tree handles drought fairly well, but even moisture still helps it size and set a better crop. Let the top half of the root zone dry between waterings.
Soil
Plant in deep, well-drained loam loaded with organic matter, and stay clear of waterlogged or compacted ground that rots the roots. A pH of 6.0 to 7.0 suits apples, sitting close to neutral.
Temperature
Apples are hardy, taking a span from about -40°F to 95°F (-40°C to 35°C) through the year, and they grow across hardiness zones 3 to 8. They also need a run of winter chill before they'll flower, so pair the cultivar to your zone.
Humidity
Plain outdoor air in the 40% to 70% range works fine, so there's no figure to chase. Airflow counts for far more, since damp, crowded branches are where scab and other fungal diseases take hold.
Feeding
Feed once in early spring before new growth breaks, with a balanced or nitrogen-based fertilizer. Stay light on the nitrogen, though, because a surge of soft growth is precisely what fire blight feeds on.
Pruning
Prune each year in late winter while the tree is dormant, training it to a strong central leader or open center. Take out dead, diseased, or crossing wood and open the canopy so light and air reach the fruit. A light summer trim helps tame an over-vigorous tree.
Repotting
Apples live in the ground, not a pot, so most trees never call for repotting. A dwarf tree in a large container is the exception, wanting a refresh or a shift to a bigger pot every 2 to 3 years to keep its roots content.
Size & spacing
Mature size swings widely with the rootstock, from a dwarf around 8 feet (240 cm) to a standard near 30 feet (9 m) tall and nearly as wide. Spread runs from about 8 to 25 feet (2.4 to 7.5 m), so leave each tree room to reach full size without crowding.
When to plant
An apple tree keeps an unhurried calendar. Set bare-root trees in early spring once the ground thaws and the tree is still dormant, then watch for blossom in mid to late spring. The fruit fills out and ripens from late summer into fall, roughly August to October depending on the cultivar.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Early spring while dormant, after the ground thaws, for bare-root trees; container trees can go in from spring to early summer.
- Harvest: Blooms mid to late spring; fruit ripens late summer to fall (about August to October) depending on cultivar.
Hardiness
USDA hardiness zones: 3–8
Temperature: down to -40°C
Troubleshooting
Most apple trouble turns up on the leaves, in the blossoms, or hidden inside the fruit, and the cool, wet weather of spring touches off much of it. Train your eye to the early marks and you can step in before a disease settles in for the season. Match what you see below, then act while it still does some good.
Scorched black blossoms and shoot tips bent into a shepherd's crook
When the blossoms and the soft new shoot tips wilt, turn black, and curl over into a hooked shepherd's crook as if scorched by flame, you are looking at fire blight. The bacterium tears through warm, wet bloom weather and leaves the wood looking burned. Cut out the infected growth 8 to 12 inches below the visible damage, and wipe the blades with disinfectant between every single cut so you don't carry the bacteria down the branch. Keep nitrogen low, since the soft, fast growth it produces is exactly what the disease feeds on.
Fix:
- Prune out infected wood at least 8 to 12 inches below visible symptoms.
- Disinfect pruning tools between every cut to avoid spreading the bacteria.
Velvety olive-to-black blotches across the leaves and skin, leaves falling early
Those fuzzy, olive-green to black velvety patches spreading over the leaf surface and dimpling the fruit skin are apple scab, a fungus that stirs in cool, damp spring air and rides up from last autumn's fallen leaves. Sweep up and bag every leaf beneath the tree once it drops, thin the branches for moving air, and put down a protectant fungicide at bud break when spring turns wet. Scab-resistant cultivars spare you most of this work.
Fix:
- Rake and remove fallen leaves to reduce overwintering spores.
- Apply a labeled fungicide on a protectant schedule starting at bud break in wet springs.
Glowing orange flecks on the leaf top with tiny tubes hanging beneath
The bright orange to yellow spots dotting the upper leaf, often backed by little fringed tube-like growths on the underside, point to cedar-apple rust. The fungus runs on two hosts, shuttling between your apple and any juniper or red cedar standing close by. Take out the alternate juniper hosts where you can, and treat from pink bud through early fruit set in the bad spots. The cleaner long-term answer is a rust-resistant cultivar with junipers kept at a distance.
Fix:
- Remove nearby juniper or red cedar hosts where practical.
- Apply a labeled fungicide from pink bud through early fruit set in problem areas.
Wormy apples riddled with tunnels and crumbly brown frass at the core
Cut an apple open and find winding tunnels packed with crumbly brown frass, plus a small entry hole punched in the skin, and you have met the codling moth. Its larvae drive straight for the core and leave the textbook wormy apple. Hang pheromone traps to catch the adults and time the sprays to egg hatch, thin the fruit, and clear off every dropped or infested apple so the next brood has nowhere to land. Bagging single fruit also works on a small backyard tree.
Fix:
- Thin fruit and remove and destroy dropped or infested apples.
- Use pheromone traps to time labeled insecticide or kaolin sprays, or bag individual fruit.
Toxicity
The ripe flesh of an apple is a wholesome snack for people and a fine treat for many animals. The hazard lives in the seeds, leaves, twigs, and bark, which carry cyanogenic compounds that give off cyanide once they're chewed. Keep prunings and wilted leaves clear of pets and livestock, and don't let an animal work through whole apples or cores.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Caution
A cat seldom takes an interest in the fruit, but the small seeds, the leaves, and the bark release cyanide as they break down. Keep cores and prunings somewhere a curious cat can't sink its teeth in.
Dogs Caution
A bite of ripe flesh does no harm, but the seeds, the woody core, the leaves, and the bark do, since they give off cyanide. Never let a dog chew a whole apple or the windfalls under the tree.
Horses Caution
A horse will relish a slice of apple flesh, and a few are fine. The real hazard is wilted leaves and a large mouthful of seeds, so keep prunings and fallen fruit clear of the paddock.
Rabbits Caution
A small piece of ripe flesh makes a fine treat, but never the seeds, and keep them clear of the leaves and twigs.
Livestock Moderate
For cattle, goats, and sheep the true danger is wilted apple leaves, which release cyanide as they dry out. Keep prunings and cut branches out of the pasture.
Birds Caution
The flesh is harmless, but apple seeds carry cyanide and birds feel it keenly. Pick out every seed before you share a piece.
People Ripe fruit safe
The ripe fruit is a wholesome snack. A cyanide compound sits inside the seeds, but it would take a big mouthful of chewed seeds to matter, so simply leave the cores aside.
The danger is the wilting leaves, stems, and chewed seeds (cyanide), not the flesh. Keep pets and livestock away from prunings and wilted leaves and do not let them chew large numbers of seeds; sliced ripe flesh with the core and seeds removed is a safe treat in moderation.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
Thousands of apple cultivars are out there, but a small set shows up in most backyards and on most nursery benches. These are the ones worth knowing by name, and keep in mind you'll want two compatible varieties for pollination.
Honeycrisp
A cold-hardy favorite prized for the loud, juice-filled snap of its flesh, though it can be touchy to grow well and to keep in storage.
Gala
A sweet, mild apple wearing red-and-yellow stripes that colors up early and also serves as a dependable pollinizer for other trees.
Granny Smith
A tart, firm green apple that asks for a long warm season, keeps its shape in the oven, and stores for months.
Fuji
A very sweet apple with dense, heavy flesh that keeps for ages but needs a long growing season to color all the way through.
Red Delicious
The familiar deep-red, heart-shaped dessert apple, mild in taste beneath a notably thick skin.
How to propagate
Apples don't come true from seed, so nearly every tree worth eating from is grafted. Here's how the methods stack up and how long each takes before it hands you fruit.
GraftingModerate
Late winter to early spring while both scion and rootstock are dormant. · Bears fruit in roughly 2 to 4 years on dwarfing rootstock, longer on standard.
This is the usual route for holding a named cultivar true, fusing scion wood to a rootstock while both pieces sit dormant in late winter or early spring. The rootstock decides the tree's eventual size, how quickly it comes into fruit, and how it copes with your soil. Look for apples in roughly 2 to 4 years on dwarfing rootstock, with a longer stretch on standard.
GraftingModerate
Late summer, when bark slips and buds are mature. · Bud grows out the following spring; fruiting follows in a few years.
This is the tidy nursery form of grafting, tucking one mature bud under a rootstock in late summer when the bark peels back easily. The bud rests through winter, breaks out the next spring, and the young tree comes into fruit a few years on. Setting a single bud per rootstock makes scarce scion wood go far further than a full graft would.
SeedModerate
Cold-moist stratify seeds about 6 to 8 weeks, then sow in spring. · Several years to fruit, and not true to type.
Starting from seed calls for a cold, moist chill of about 6 to 8 weeks before you sow in spring. The seedlings need several years to fruit and won't echo the parent apple, so this path is meant for raising rootstocks or breeding fresh varieties rather than copying one you already enjoy.
Myths
Drop a seed from a delicious apple in the ground and you'll grow that very apple.
Seeds don't carry an apple true. Each seedling shuffles a new mix of genes and usually fruits small and sour, looking nothing like the apple it came from. Named cultivars are reproduced by grafting scion wood onto a rootstock, and that is the only way to hold a variety steady.
One apple tree on its own will dependably load up with a full crop.
Most apple cultivars are self-unfruitful and cannot fertilize their own blossoms. You usually need a second, compatible variety nearby that flowers on the same schedule, or a crabapple within reach, before the tree fills out with fruit.