Tree · Rosaceae
Plum
Prunus domestica
Give it full sun, deep soil, and a yearly pruning, and a plum tree will happily pay you back with baskets of fruit.
Full sun
Every 7–14 days
USDA 4–9
10–20 ft · 3–6 m
Overview
A plum tree is a wonderful first tree to grow, and it is more forgiving than many beginners expect. It sits in the rose family beside cherries, peaches, and apricots, and it comes in two friendly groups: the hardy European plums grown for prunes and cooking, and the juicier Japanese plums that ripen a touch earlier and taste lovely fresh. Both simply ask for a sunny spot and deep, well-drained soil, and both reward a little steady attention with the pruning.
Most of the success comes from choosing well at the very start, and that part is easy to get right. Some European plums set fruit on their own, while most Japanese plums like a second compatible tree blooming nearby so they can crop. Sort out the pollination and a healthy tree comes into bearing in about 3 to 5 years, then carries fruit for decades to come.
The trade for that long life is gentle, ongoing care, and none of it is hard once you get the rhythm. Plums do attract a few familiar problems, from black knot in the wood to brown rot in the fruit, but a clean, open canopy is your best friend against all of them. Keep up with the dropped fruit and dead wood, and mistakes are easy to recover from while the tree stays healthy and heavy with plums.
Care
The short version: give it full sun, deep and well-drained soil, and steady moisture while the fruit fills out. Prune each winter to keep the canopy open, feed lightly in early spring, and if the variety needs a pollinizer, just pair it with a compatible friend nearby.
Light
Give your plum full sun, ideally 6 or more hours a day, and it will ripen sweet fruit and dry its canopy nicely after rain. A little partial sun is fine and won't ruin anything, but real shade quietly trades away both the crop and the open, airy growth that keeps disease at bay.
Water
Let the top half of the root zone dry between waterings, then water deeply, and you will be in good shape. Young trees like regular drinks, while settled ones shrug off some drought yet size and set fruit far better with even moisture as the plums fill out. Just steer clear of soggy ground, which invites root and crown rot.
Soil
Plant into deep, well-drained loam with plenty of organic matter mixed in, and the tree will feel right at home. A pH of 6.0 to 7.0 suits it well, and the single thing to avoid is heavy, waterlogged soil that rots the roots and crown.
Temperature
Plums are tough, cold-hardy trees that take a wide range in stride, from about -29°F to 95°F (-34°C to 35°C). European types handle hard winters with ease, though a late frost during bloom can still cost a season's fruit, so it helps to know your local spring.
Humidity
Ordinary outdoor humidity in the 40% to 70% range is perfectly fine, so there is really no number to fuss over. What matters far more is airflow, because long damp spells in a crowded canopy are exactly what brown rot and black knot are waiting for.
Feeding
Feed just once in early spring before new growth begins, using a balanced fertilizer or a simple nitrogen source. A light hand is best here, since too much nitrogen pushes soft growth that fruits poorly and catches disease more easily.
Pruning
Prune every year in late winter while the tree rests, and it becomes second nature quickly. Open Japanese types to a vase shape and train European types to a modified central leader, taking out dead, diseased, and crossing wood, clearing any black knot galls, and thinning the canopy so light and air can reach the fruit.
Repotting
Plums are usually grown in the ground rather than in pots, so most gardeners never repot at all. Dwarf trees in large containers are the exception, and they simply need their soil refreshed or a move to a bigger pot every 2 to 3 years.
Size & spacing
A standard plum grows to about 10 to 20 feet (3 to 6 m) tall and spreads nearly as wide, so give it comfortable room. Set trees far enough apart that the grown canopies won't crowd, and you will keep air moving and disease easier to manage.
When to plant
Plums follow the seasons, and that makes them easy to plan around. Set bare-root, grafted trees out in early spring while they are still dormant and the soil can be worked, enjoy the bloom in early to mid spring, and pick the fruit from late summer into early fall as it softens and colors up.
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 as bare-root, grafted trees, after the soil can be worked; container trees can go in from spring to early summer.
- Harvest: Blooms early to mid spring; European plums ripen late summer to early fall (about August to September), while Japanese plums often ripen somewhat earlier.
Hardiness
USDA hardiness zones: 4–9
Temperature: down to -34°C
Troubleshooting
Most plum trouble turns up in the wood, the blossoms, or the ripening fruit, and catching it early is more than half the battle. Spot it soon and you can usually prune or clean your way past it before it spreads. Match what you are seeing below, then act while a small step still makes a big difference.
Rough black knots wrapping around twigs and limbs
If you spot rough black knots wrapping around a twig, take heart, because this is black knot and gardeners deal with it every year. The fungus slips into fresh spring shoots and builds woody galls that return each season, but you can stay ahead of it. Late in winter, cut each knot away, going a full 6 to 8 inches below the swelling, and burn or bin what you remove. Wipe your saw between cuts, clear out any wild plums or cherries nearby, and the tree will thank you.
Fix:
- Prune out knots in late winter, cutting at least 6 to 8 inches below each gall, and destroy the prunings.
- Disinfect pruning tools between cuts and remove any infected wild plums or cherries nearby.
Blighted blossoms and fruit rot with a tan bloom
Browning blossoms and softening fruit dusted with tan powder can feel discouraging, but this is brown rot and it is manageable. The fungus moves in during warm, wet weather at bloom and comes back as the fruit ripens, collapsing flowers and leaving shriveled mummies on the branch. The good news is that careful cleanup does most of the work: pick off and destroy every rotted plum and mummy you find. In a damp year, one labeled fungicide spray at bloom and another as the fruit colors up will carry you through.
Fix:
- Remove and destroy rotted fruit and mummies during the season and at cleanup.
- Apply a labeled fungicide at bloom and again as fruit ripens in wet seasons.
Little crescent scars, and young fruit falling early
Those little crescent scars on your young fruit are the calling card of the plum curculio, a small weevil, and finding them early puts you in a good spot. The adult tucks its eggs inside the fruit, the grubs tunnel through, and a cut-open windfall shows a curved larva at the center. Gathering and destroying the dropped fruit breaks the cycle nicely, and a labeled insecticide sprayed at petal fall, while the adults are out and about, keeps the next round in check.
Fix:
- Collect and destroy dropped, infested fruit to interrupt the life cycle.
- Apply a labeled insecticide at petal fall and shuck split when adults are active.
Curled, sticky leaves with sooty mold
Curled, yellowing leaves with a sticky coating are almost always aphids feeding on the soft new growth, and this one is an easy fix. They draw in ants and leave behind honeydew that darkens into sooty mold, which looks worse than it is. A firm spray of water knocks a light crowd right off, and insecticidal soap or horticultural oil handles the rest. Give the lady beetles and lacewings a chance to help before you reach for anything stronger.
Fix:
- Wash light infestations off with a strong jet of water or use insecticidal soap or horticultural oil.
- Preserve natural enemies such as lady beetles and lacewings and treat only when populations are high.
Toxicity
The ripe flesh is a treat, but the rest of the tree is best left alone, and that is easy enough to manage once you know. Leaves, stems, bark, and the pits carry cyanogenic compounds that release cyanide when chewed or wilted, and wilted prunings are especially risky for grazing animals. Keep pets and livestock away from clippings and fallen pits, and never let anyone crack open a stone, and you will have no trouble.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Toxic
A quick taste of ripe flesh rarely does more than upset a cat's stomach a little, so try not to panic over that. Chewing leaves, twigs, or a cracked pit is the real worry, since that releases cyanide, and drooling, bright red gums, or labored breathing mean it is time to treat things as an emergency.
Dogs Toxic
Dogs love to crunch a fallen pit, and that is where the trouble lies, because the kernel and the wilting leaves give off cyanide while the whole pit can lodge in the gut. If a dog has been chewing the tree and shows vomiting, panting, or weakness, a quick call to the vet is the kindest move.
Horses Toxic
Horses need extra care here, and wilted leaves blown into a paddock are the classic trap to watch for. The cyanide in them can bring on brick-red gums, dilated pupils, staggering, and collapse within minutes, so keeping prunings and fallen branches well out of reach keeps everyone safe.
Rabbits Toxic
Plum leaves, bark, and twigs are not safe browse for a rabbit, since the same cyanogenic compounds gather as the foliage wilts. The easy answer is to skip the prunings altogether and offer familiar rabbit-safe greens instead.
Livestock Toxic
Grazing animals like cattle, goats, and sheep are most often harmed by wilted leaves from a fallen or pruned branch, which concentrate cyanide as they dry. Distress, gasping, and collapse can come on within an hour, so fencing stock away from any plum prunings is a simple, reassuring habit.
Birds Caution
Birds can enjoy the ripe flesh, and plenty of fruit-eaters do just that in the wild, so there is no need to worry there. The pits and leaves are the catch, because the cyanide inside is dangerous if a bird cracks the kernel, so offer only pitted flesh to be safe.
People Ripe fruit safe
Ripe plums are a wholesome, welcome fruit that you can enjoy fresh or cooked with confidence. The one thing to mind is the pit, which holds cyanide and should never be cracked open, so spit it out and gently remind children not to chew it.
The hazard is the wilting leaves, twigs, and the pits (cyanide), not the ripe flesh. Keep pets and livestock away from prunings, wilted foliage, and fallen pits; pitted ripe plum flesh is a safe occasional 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
Hundreds of plum cultivars exist, which sounds daunting, but only a handful turn up again and again in home orchards. These are the friendly names worth getting to know first.
Stanley
A dependable, widely grown European prune plum that fruits well on its own and gives blue freestone plums lovely for drying, cooking, or eating straight off the tree.
Damson
A small, tart, blue-black European plum most loved for the jams, preserves, and cooking it makes rather than for fresh snacking.
Santa Rosa
A much-loved Japanese plum whose juicy reddish-purple fruit is partly self-fruitful yet crops most generously with a friendly pollinizer close by.
Methley
An early, heat-tolerant Japanese plum that fruits on its own and tastes sweet, which makes it a gentle choice for warmer gardens.
How to propagate
Plums are not started from seed the way an annual is, and that is perfectly normal. Named trees are joined onto rootstock, while seed is saved mostly for raising those rootstocks or having a little fun breeding something new.
GraftingModerate
T-budding in late summer when bark slips, or whip grafting onto rootstock in late winter while dormant. · Bears fruit in roughly 3 to 5 years depending on rootstock and cultivar.
Named plums won't come true from a pit, so growers join them onto plum rootstocks that quietly set the tree's size, vigor, and comfort in your soil, and this is easier than it sounds. You can T-bud in late summer while the bark still slips, or whip graft onto dormant rootstock in late winter, whichever suits your season. Either way, the young tree settles in and starts bearing in about 3 to 5 years, depending on the rootstock and cultivar.
SeedModerate
Cold-moist stratify the cleaned pits over winter, then sow in spring. · Several years to fruit, and seedlings are not true to type.
Raising a plum from a pit is a fun project, though it is really meant for growing rootstock or breeding new types rather than copying a named plum. Clean the pits, give them a cold, moist winter so dormancy breaks, and sow them in spring. Just go in expecting several years before fruit and a seedling that won't match its parent, and enjoy the surprise for what it is.
Myths
A plum will only fruit if a second tree stands beside it.
It really does depend on the type, so there is no single rule to memorize. Plenty of European plums such as Stanley are self-fruitful and crop happily alone, while most Japanese plums and a few European ones do best with a compatible cultivar blooming alongside them. A quick check of the variety before you plant saves any surprise later.
Prunes must grow on some other fruit that isn't a plum.
Good news for the curious: prunes are simply dried plums. They come from certain freestone European cultivars that dry down cleanly around the pit without spoiling, which is why some plums make wonderful prunes and others just are not suited to it.
Plum pits are harmless to chew.
The pits, leaves, and stems carry cyanogenic compounds that release cyanide when crushed or chewed, so this one is worth taking seriously. A swallowed pit can also block the gut, so the safe habit is simple: spit it out and keep it away from pets and children.