Tree · Rosaceae
Apple
Malus domestica
Hand 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 one to plant for the long haul. It sits in the rose family and has been bred and grafted across thousands of years into the named varieties you spot on supermarket shelves. Drop one into good ground and it can keep cropping for 30 years or more, growing into the yard as a fixture rather than a one-season project.
Here's the catch that surprises most beginners: pollination. Most apple cultivars can't fertilize their own blossoms, so a solitary tree flowers gorgeously and then sets next to nothing. To win a real crop you need a second, compatible variety flowering at the same moment within bee range, or a crabapple pitching in close by. Pencil in two trees from the start, or confirm a neighbor already grows one.
One more factor decides whether an apple will even thrive where you live: chill hours. The tree wants a run of winter cold to snap out of dormancy and flower come spring, and cultivars vary in how much they need. Pair the variety to your zone, give it sun and a yearly prune, and from there it's the patient, steady joy of watching a tree come into its own.
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 each winter, and rein in nitrogen so the new growth stays tough.
Light
An apple tree craves full sun, meaning 6 or more hours of direct light each day, and it puts up with no real shade. Sun powers the flower buds and ripens the fruit, so a shaded tree hands you weak growth, more disease, and a thin crop.
Water
Young and newly planted trees want steady water as their roots spread out, so soak them deeply every 7 to 14 days through dry spells. An established tree shrugs off drought fairly well, yet even moisture still helps it size up and set a better crop. Let the top half of the root zone dry between drinks.
Soil
Plant into deep, well-drained loam loaded with organic matter, and dodge waterlogged or compacted spots that rot roots. A pH of 6.0 to 7.0 suits apples nicely, landing close to neutral.
Temperature
Apples are tough customers, riding out a range from about -40°F to 95°F (-40°C to 35°C) through the seasons, and they grow across hardiness zones 3 to 8. They also need a run of winter chill to flower, so pair the cultivar to your zone.
Humidity
Ordinary outdoor air in the 40% to 70% band works fine, so there's no figure to chase. Airflow counts for far more, since damp, crowded branches are how scab and other fungal diseases take off.
Feeding
Feed once in early spring before new growth wakes up, reaching for a balanced or nitrogen-based fertilizer. Go easy on the nitrogen, though, because a rush of soft growth is exactly what fire blight feeds on.
Pruning
Prune every year in late winter while the tree is dormant, shaping it toward 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 overvigorous tree.
Repotting
Apples belong in the ground, not a pot, so most trees never need repotting. The exception is a dwarf tree in a large container, which wants a refresh or a bump to a bigger pot every 2 to 3 years to keep its roots happy.
Size & spacing
Mature size swings widely with the rootstock, from a dwarf around 8 feet (240 cm) up to a standard near 30 feet (9 m) tall and nearly as wide. Spread runs roughly 8 to 25 feet (2.4 to 7.5 m), so hand each tree the room to fill out without crowding its neighbors.
When to plant
An apple tree keeps a slow, steady calendar. Set bare-root trees in early spring once the ground thaws and the tree still sleeps, then watch for blossom in mid to late spring. Fruit follows from late summer into fall, landing somewhere around 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, the blossoms, or deep inside the fruit, and spring's cool, wet stretches kick off plenty of it. Train your eye to catch the early signs and you can move in before a disease digs in for the season. Match what you see below, then act while action still pays off.
Blossoms and shoot tips turn black and hook over like a shepherd's crook
Scorched-looking shoots that wilt and curl signal fire blight, a bacterium that tears through warm, wet bloom weather. Cut infected wood away 8 to 12 inches below the damage you can see, and swab your blades with disinfectant after every single cut so you don't ferry the bacteria along the branch. Hold back on nitrogen too, because soft, racing growth is precisely what it thrives 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.
Fuzzy dark patches creep across leaves and fruit as foliage drops too soon
Spot velvety dark blotches in cool, damp spring weather and you have apple scab, a fungus that overwinters in last season's fallen leaves and surges back. Sweep up every leaf beneath the tree each fall, prune to keep air moving, and reach for a protectant fungicide at bud break when spring turns wet. Better yet, plant a scab-resistant cultivar and skip most of the battle.
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 dot the leaves with strange tubes on the underside
Those bright orange marks point to cedar-apple rust, a fungus that demands two hosts and shuttles back and forth between your tree and any juniper or red cedar growing close by. Yank out alternate juniper hosts wherever you can, and spray from pink bud through early fruit set in stubborn spots. The cleanest lasting answer: plant a rust-resistant cultivar and keep junipers 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.
Tunnels and crumbly brown frass riddle the inside of wormy apples
Tunnels driving toward the core mark the work of the codling moth, whose larvae deliver the classic wormy apple. Hang pheromone traps to track the adults so you can time sprays to egg hatch, thin your fruit, and gather up every dropped or infested apple to starve the next generation. On a single backyard tree, bagging each fruit by hand does the trick too.
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
Ripe apple flesh is a wholesome snack for people and a welcome treat for plenty of animals. The hazard sits in the seeds, leaves, twigs, and bark, which carry cyanogenic compounds that release cyanide once chewed. Keep prunings and wilted leaves away from pets and livestock, and don't let any animal gorge on whole apples or cores.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Caution
Cats hardly ever go for the fruit, yet the seeds, leaves, and bark give off cyanide as they break down. Stash cores and prunings somewhere a curious cat can't get its teeth into them.
Dogs Caution
A nibble of ripe flesh poses no problem, but the seeds, core, leaves, and bark do, since they release cyanide. Don't let a dog chew through a whole apple or scavenge windfalls.
Horses Caution
Horses relish a slice of apple flesh, and a couple do no harm. Wilted leaves and big mouthfuls of seeds are the worry, so keep prunings and fallen fruit clear of the paddock.
Rabbits Caution
A little ripe flesh makes a welcome treat, but never the seeds, and keep rabbits clear of the leaves and twigs.
Livestock Moderate
For cattle, goats, and sheep the genuine hazard is wilted apple leaves, which release cyanide as they dry. Keep prunings and branches off the pasture.
Birds Caution
Flesh is no trouble, but apple seeds hold cyanide and birds react sharply to it. Pick out every seed before you share a piece.
People Ripe fruit safe
Ripe fruit makes a wholesome snack. The seeds carry a cyanide compound, but it would take a big handful of chewed seeds to do anything, so just leave the cores.
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
Apple cultivars number in the thousands, but a handful show up in most backyards and at most nurseries. These are the names worth knowing, and keep in mind you'll want two compatible varieties for pollination.
Honeycrisp
A cold-hardy standout prized for its bold, juicy snap, though growing and storing it well can test your patience.
Gala
A sweet, gentle red-and-yellow striped apple that ripens early and earns its keep twice over as a dependable pollinizer for nearby trees.
Granny Smith
A firm, tart green apple that craves a long warm season, bakes superbly, and keeps for months on end.
Fuji
A dense, intensely sweet apple that stores for ages but asks for a long growing season to ripen fully.
Red Delicious
The familiar deep-red, heart-shaped dessert apple, mild on flavor beneath a notably thick skin.
How to propagate
Apples won't come true from seed, so nearly every tree worth eating from is grafted. Here's how the methods stack up and how soon each one delivers 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 go-to method for holding a named cultivar true to type, fusing scion wood to a rootstock while both rest dormant in late winter or early spring. Your choice of rootstock dictates the tree's size, how quickly it fruits, and how gamely it copes with your soil. Look for apples in roughly 2 to 4 years on dwarfing rootstock, with a longer wait 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 streamlined nursery take on grafting, tucking one mature bud into a rootstock in late summer while the bark peels away easily. The bud rests through winter, breaks out the next spring, and the young tree comes into fruit a few years on. A single bud per rootstock makes scarce scion wood go far further than a full graft.
SeedModerate
Cold-moist stratify seeds about 6 to 8 weeks, then sow in spring. · Several years to fruit, and not true to type.
Raising apples from seed calls for a cold, moist chill of about 6 to 8 weeks ahead of a spring sowing. Seedlings take several years to fruit and won't echo the parent apple, so save this path for growing rootstocks or breeding fresh varieties rather than duplicating one you adore.
Myths
Plant a seed from a tasty apple and the tree will grow that same apple.
Seeds won't reproduce the parent apple. Each seedling shuffles a new set of genes and usually grows small, sour fruit with no resemblance to what you ate. Named cultivars are reproduced by grafting scion wood onto a rootstock, the one method that holds a variety true.
A single apple tree will reliably set a full crop on its own.
Most apple cultivars are self-unfruitful and can't fertilize their own blossoms. You usually need a second, compatible variety nearby that flowers at the same time, or a crabapple close at hand, before the tree fills out a real crop.