FruitStraightforward

Plum

Prunus domestica

The easiest tree fruit for most British gardens, because the cultivars people actually buy are self-fertile — no partner to arrange, no flowering groups to match. Two things need remembering: prune in summer and never in winter, and thin the crop, because a plum will happily set more fruit than its own branches can carry.

Position: Full sun
Water: moderate demand
Drainage: Moisture-retentive
Grows to: 250–450 cm × 250–400 cm
Hardiness: H6
Harvest: July to September
Difficulty: Straightforward

Described view

A plum branch carrying a dense cluster of green fruitlets alongside a thinned section spaced along the branch

August

Harvest

Plum’s year

Resolved for United Kingdom (general). Every window is stored against a climate event rather than a date, so a late frost pocket runs later than the band shows. What else August calls for.

Activity	J	F	M	A	M	J	J	A	S	N	D
Plant	January.	February.	March.							November.	December.
In flower			March.	April.
Harvest							July.	August.	September.
Prune				April.	May.	June.	July.
Dormant	January.										December.

Names that cause confusion

damson — A distinct group within Prunus domestica with small acid fruit for cooking. Grown identically and generally hardier and more tolerant of exposure than dessert plums.

Timing that travels

The band above resolves this plant's windows into months for one region. These are the windows themselves, stored against a climate event rather than a date — which is the form that survives being carried to a colder garden, a frost pocket, or next year.

Pollination

Whether one plant on its own will set fruit, and what has to be true if it will not.

One plant on its own will crop.

Self-fertility: Self-fertileSourced guidanceDepends on conditions
Partner needed: No partner needed
Pollen moved by: Insects
What decides compatibility: flowering group

Where the pollination figures come from

Self-fertilitySourced guidanceDepends on conditionshigh confidence

Applies when: True of the common garden cultivars — 'Victoria', 'Czar', 'Marjorie's Seedling'. Some gages and older cultivars are self-sterile and do need a partner, so it is worth checking the specific cultivar.

Royal Horticultural Society: Plum pollination

Checked 2026-08-13

Partner neededSourced guidancehigh confidence

Royal Horticultural Society: Plum pollination

Checked 2026-08-13

Pollen moved byHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

What decides compatibilityHorticultural consensusmoderate confidence

Royal Horticultural Society: Plum pollination groups

Checked 2026-08-13

The self-fertility of 'Victoria' is the main reason plums are the tree fruit most often planted singly and successfully.

Which of these will pollinate which

Worked out from flowering groups and ploidy for the 11 cultivars GrowingHQ holds — a small fraction of those in cultivation. A cultivar that is not listed has not been ruled out; it has not been recorded. Read a row as “this cultivar’s pollen reaches…”.

Pollen from	Blue Tit	Cambridge Gage	Czar	Jubilee	Marjorie's Seedling	Merryweather Damson	Opal	Oullins Gage	Pershore	Shropshire Prune	Victoria
Blue TitGroup 3	—	yes	yes	yes	no	yes	yes	yes	yes	not known	yes
Cambridge GageGroup 4	yes	—	yes	yes	yes	yes	yes	yes	yes	not known	yes
CzarGroup 3	yes	yes	—	yes	no	yes	yes	yes	yes	not known	yes
JubileeGroup 3	yes	yes	yes	—	no	yes	yes	yes	yes	not known	yes
Marjorie's SeedlingGroup 5	no	yes	no	no	—	yes	no	yes	no	not known	no
Merryweather DamsonGroup 4	yes	yes	yes	yes	yes	—	yes	yes	yes	not known	yes
OpalGroup 3	yes	yes	yes	yes	no	yes	—	yes	yes	not known	yes
Oullins GageGroup 4	yes	yes	yes	yes	yes	yes	yes	—	yes	not known	yes
PershoreGroup 3	yes	yes	yes	yes	no	yes	yes	yes	—	not known	yes
Shropshire Prune	not known	not known	not known	not known	not known	not known	not known	not known	not known	—	not known
VictoriaGroup 3	yes	yes	yes	yes	no	yes	yes	yes	yes	not known	—

Blue Tit crops on its own.

A naturally small, self-fertile plum — one of the few that suits a large container or a very small garden.

Cambridge Gage is pollinated by Blue Tit, Czar, Jubilee, Marjorie's Seedling, Merryweather Damson, Opal, Oullins Gage, Pershore, Victoria.

A gage rather than a plum: smaller, greener and far better flavoured, at the cost of reliability. The erratic cropping gages are known for is partly the partial self-fertility recorded here.

Czar crops on its own.

An early cooking plum with a reputation for cropping in cold and exposed sites where others fail. Where late frosts are the recurring problem rather than the occasional one, this is the usual recommendation.

Jubilee crops on its own.

A Victoria seedling with larger fruit, ripening a little earlier. Chosen where Victoria is wanted but bigger plums are preferred.

Marjorie's Seedling crops on its own.

A late cooking plum, flowering late enough to dodge many spring frosts — which is the main reason to choose it. Still picking in late September when Victoria finished a month earlier.

Merryweather Damson crops on its own.

A damson with unusually large fruit, self-fertile and hardy enough for exposed northern sites. Damsons are cooking fruit — sharp raw, excellent preserved — and this is the one most often planted as a garden tree rather than a hedge.

Opal crops on its own.

The earliest dessert plum in general cultivation, ripening several weeks before Victoria. Self-fertile and compact enough for a small garden.

Oullins Gage crops on its own.

The self-fertile gage, and therefore the practical answer where gage flavour is wanted from a single tree. Larger and less intensely flavoured than Cambridge Gage — the trade is deliberate.

Pershore crops on its own.

A yellow cooking plum grown historically for jam and canning. Dependable and hardy; not worth eating raw, which is not a criticism of a culinary cultivar.

Shropshire Prune crops on its own.

The traditional damson: small, intensely flavoured, on a hardy tree that tolerates wind and poor soil. GrowingHQ has not recorded a flowering group for it, so the checker will say so rather than assume one — it does not matter, since the cultivar is self-fertile.

Victoria crops on its own.

The default British plum: self-fertile, reliable, and so heavy-cropping that it breaks its own branches if the fruit is not thinned. Thinning to about one plum every 5 cm along a branch is the standard remedy.

Rootstocks — the decision that fixes the size

A grafted fruit tree is two plants. The top decides what the fruit tastes like; the rootstock decides how big the tree gets, how soon it crops and whether it needs staking for life.

Pixy for a garden-sized tree, St Julien A for a fan or where the soil is poorer. Plums on their own roots become far too large for most gardens.

Heights are ranges and always will be — the same rootstock behaves differently on light sand and deep loam.
Rootstock	Vigour	Mature height	Staking	In a container
Pixy	Dwarfing	250–300 cm	Stake while establishing	possibleHorticultural consensusDepends on conditions
St Julien A	Semi-vigorous	350–450 cm	Stake while establishing	unsuitable

Where the rootstock figures come from

Pixy: VigourSourced guidancehigh confidence
Royal Horticultural Society: Plum rootstocks
Checked 2026-08-13
Mature heightSourced guidancehigh confidence
Royal Horticultural Society: Plum rootstocks
Checked 2026-08-13
StakingSourced guidancehigh confidence
Royal Horticultural Society: Planting fruit trees
Checked 2026-08-13
In a containerHorticultural consensusDepends on conditionsmoderate confidence
Applies when: A large container and reliable watering. Less well documented than apple on M27.
No external citation — see the evidence type above.
Checked 2026-08-13
St Julien A: VigourSourced guidancehigh confidence
Royal Horticultural Society: Plum rootstocks
Checked 2026-08-13
Mature heightSourced guidancehigh confidence
Royal Horticultural Society: Plum rootstocks
Checked 2026-08-13
StakingSourced guidancehigh confidence
Royal Horticultural Society: Planting fruit trees
Checked 2026-08-13
In a containerSourced guidancehigh confidence
Too vigorous to hold in a container long term.
Royal Horticultural Society: Plum rootstocks
Checked 2026-08-13

Pruning and training

Every piece of fruit pruning advice follows from one fact: where the plant carries next year's crop.

Fruits on: Spurs on older wood

Fruit forms on short stubby spurs that persist on wood two years old and older. Pruning aims to build and renew those spurs, so the framework is kept and young growth is shortened.

Sourced guidanceDepends on conditionshigh confidence

Applies when: Plums fruit on both two-year-old wood and older spurs, so light renewal keeps a tree productive.

Royal Horticultural Society: Pruning plums

Checked 2026-08-13

Cutting the wrong wood does not damage the plant. It removes the crop, and the loss is not visible until the following summer.

Forms it can be grown as

Bush
Half-standard
Pyramid
Fan

source

Sourced guidancehigh confidence

Royal Horticultural Society: Trained fruit forms

Checked 2026-08-13

A fan against a wall needs wires; free-standing forms need none once established.

source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Formative pruningApril, May
Establish a strong open framework in the first years, because a plum carrying a heavy crop on a narrow branch angle will tear the branch out.
Build an open centre with wide-angled branches in late spring of the first few years. Narrow forks are the weak point that fails later under fruit weight.
source
Sourced guidancehigh confidence
- Royal Horticultural Society: Pruning plums
Checked 2026-08-13
Annual maintenanceMay, June, July
Remove dead, crossing and congested wood and keep the tree to a size that can be picked, without opening it to silver leaf.
Prune between late spring and midsummer, while the tree is growing strongly and can seal wounds quickly. Keep it light: plums need far less pruning than apples.
source
Sourced guidancehigh confidence
- Royal Horticultural Society: Pruning plums
Checked 2026-08-13
Timing matters: Pruning in autumn or winter opens fresh wounds when silver leaf spores are abundant. This is the reason for the season, and it is not a preference.

What you are committing to

Fruit is a multi-year decision. These are the numbers a nursery label rarely carries.

First worthwhile crop: 3–5 years
Propagated by: Grafting or budding
Fruit type: Stone fruit

Where these figures come from

First worthwhile cropSourced guidancehigh confidence: Royal Horticultural Society: Growing plums
Checked 2026-08-13
Propagated bySourced guidancehigh confidence: Royal Horticultural Society: Grafting fruit trees
Checked 2026-08-13

Keeping it: Does not keep. Plums are eaten, cooked or frozen within days of picking, which is why a single tree produces a glut.

source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

A plum picked ripe from the tree is a different fruit from one picked firm for transport. Gages in particular are almost never sold in eatable condition.

Conditions it needs

Light: Full sun
Direct sun: 6 hours a day or more
Frost: Very hardySourced guidanceDepends on conditions
Hardiness rating: H6 (RHS)
Soil: Loam, Clay
Soil pH: 6–7
Drainage: Moisture-retentive
Water needs: moderate
Drought: moderate tolerance
Waterlogging: poor tolerance
Heat: good tolerance
Wind and exposure: poor tolerance

Where these figures come from

LightSourced guidancehigh confidence

Royal Horticultural Society: Growing plums

Checked 2026-08-13

Direct sunHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

FrostSourced guidanceDepends on conditionshigh confidence

Applies when: The tree is hardy; the blossom opens in late March or April and is frequently caught by frost. This is why plum crops vary so much between years.

Royal Horticultural Society: Plums — hardiness

Checked 2026-08-13

Hardiness ratingSourced guidancehigh confidence

Royal Horticultural Society: RHS hardiness ratings

Checked 2026-08-13

SoilHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Soil pHHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

DrainageHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Water needsHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

DroughtHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

WaterloggingHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

HeatHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Wind and exposureSourced guidancehigh confidence

A sheltered site matters more for the flowering window than for the tree.

Royal Horticultural Society: Growing plums

Checked 2026-08-13

On your soil

Computed by comparing this plant's recorded requirements against each soil's recorded characteristics. A recorded horticultural fact overrides the comparison where GrowingHQ holds one.

Soil	Verdict	Why
Heavy clay	Works, with one condition	Plum will crop on heavy clay, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse.
Sandy	Grows well here	Plum grows perfectly well on sandy without special measures, though it is not the soil it would choose.
Chalky and alkaline	Struggles here	Plum struggles on chalky and alkaline: The soil is substantially too alkaline for it: it wants pH 6 to 7, and this soil sits around 7.8 to 8.5. It roots to about 50 cm and this soil offers roughly 40 cm before rock or hardpan. A container or a raised bed of imported soil sidesteps the problem entirely.
Loam	Prefers this soil	Loam suits Plum as it stands: The pH suits it: it wants 6 to 7, and this soil is in that range. Loam is among the soils it is recorded as suiting. The soil holds moisture, which saves a great deal of watering. There is ample rooting depth for it.
Silty	Grows well here	Plum grows perfectly well on silty without special measures, though it is not the soil it would choose.
Peaty and acid	Works, with one condition	Plum will crop on peaty and acid, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse.
Shallow over rock	Works, with one condition	Plum will crop on shallow over rock, but one thing has to be dealt with first. It roots to about 50 cm and this soil offers roughly 25 cm before rock or hardpan.Grow it in a deep container or a raised bed. The rooting depth is not something that can be added to the ground.
Made ground and urban soil	Struggles here	Plum struggles on made ground and urban soil: It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold. It roots to about 50 cm and this soil offers roughly 30 cm before rock or hardpan. A container or a raised bed of imported soil sidesteps the problem entirely.

Not sure which you have? Four hand tests will settle it.

Space and spacing

Mature height: 250–450 cmSourced guidanceDepends on conditions
Mature spread: 250–400 cm
Rooting depth: 50–80 cm
Spacing: 300–450 cm apart

Where these figures come from

Mature heightSourced guidanceDepends on conditionshigh confidence

Applies when: 2.5–3 m on Pixy, 3.5–4.5 m on St Julien A.

Royal Horticultural Society: Plum rootstocks

Checked 2026-08-13

Mature spreadHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Rooting depthHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

SpacingSourced guidancehigh confidence

Royal Horticultural Society: Growing plums

Checked 2026-08-13

Measured centre to centre. Plants set closer than this compete for light and water long before they look crowded, and the crowding cannot be undone once they are in.

In a container

Minimum volume: 45 litres or moreHorticultural consensusDepends on conditions
Minimum depth: 45 cm

Where the container figures come from

Minimum volumeHorticultural consensusDepends on conditionsmoderate confidence

Applies when: On Pixy only, and less well documented than apple on M27.

No external citation — see the evidence type above.

Checked 2026-08-13

Minimum depthHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Only on Pixy rootstock — anything more vigorous outgrows a pot within a few years. Expect to water daily in summer and top-dress with fresh compost each spring rather than repotting a mature tree.

Where and how you can grow it

Each way of growing is assessed separately, and “not assessed” is a real answer rather than a gap we have filled in with a guess.

Method	Suitability	What it needs
Open ground	Well suited source Sourced guidancehigh confidence Royal Horticultural Society: Growing plums Checked 2026-08-13	A sheltered position for the early blossom
Traditional dug bed	Workable source Horticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13
Vertical growing	Workable source Horticultural consensusmoderate confidence Fan-trained against a warm wall, which also helps the blossom. No external citation — see the evidence type above. Checked 2026-08-13	Wires on a south or west wall; Summer pruning only
Container	Marginal Horticultural consensusDepends on conditionsmoderate confidence Applies when: On Pixy, in a large container, with consistent watering. Less well established than apple. No external citation — see the evidence type above. Checked 2026-08-13
Hydroponics	Marginal source GrowingHQ editorial positionmoderate confidence Root volume and chilling, and a tree that is difficult to keep small even on the most dwarfing stock available to it. GrowingHQ editorial synthesis — GrowingHQ Checked 2026-08-13
Greenhouse	Marginal source Sourced guidancemoderate confidence Agriculture and Horticulture Development Board — AHDB: Plums under protection Checked 2026-08-13
Polytunnel	Marginal source Sourced guidancemoderate confidence Agriculture and Horticulture Development Board — AHDB: Plums under protection Checked 2026-08-13
Windowsill	Not suitable source Horticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13

Growing it

PruningPrune only between late spring and midsummer. Winter pruning of any stone fruit invites silver leaf, which has no cure — this single rule matters more than any pruning technique.
ThinningThin the fruitlets in early summer to roughly one every 5–8 cm along the branch. A plum sets far more fruit than it can carry, and an unthinned branch snaps under the weight — taking years of framework with it.5–8 cm
SupportProp heavily laden branches in a good year rather than waiting to see whether they hold.
WateringPlums carry their crop on shallow roots and drop fruit readily when dry. Water young trees through their first two summers, and any tree in a dry spring while the fruit is setting. Irregular watering once the fruit has begun to colour is what splits it, so keep it even rather than heavy.
FeedingFeed in late winter with a general fertiliser and mulch with compost, keeping it clear of the trunk. Plums crop heavily and a tree carrying a full set will exhaust itself without it. Do not feed after midsummer: late growth does not harden before winter and is where silver leaf and canker enter.

Where this guidance comes from

PruningSourced guidancehigh confidence: Royal Horticultural Society: Pruning plums
Checked 2026-08-13
ThinningSourced guidancehigh confidence: Royal Horticultural Society: Growing plums
Checked 2026-08-13
SupportHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
WateringSourced guidancehigh confidence: Royal Horticultural Society: Plums — watering
Checked 2026-08-13
FeedingSourced guidancehigh confidence: Royal Horticultural Society: Plums — feeding
Checked 2026-08-13

The bud you cut to becomes the new shoot, and it grows in the direction it points — which is why an outward-facing bud opens the plant up and an inward-facing one crosses the middle.

Is it worth putting under cover?

Whether it will grow there is on the methods table above. This is whether the space is well spent, which is a different question and usually the one being asked.

Structure	What protection is worth	What decides it
Greenhouse	Improves reliability source GrowingHQ editorial positionmoderate confidence What protection is worth for this crop, judged against the same standard as every other record in this file. GrowingHQ editorial synthesis — GrowingHQ Checked 2026-08-13	Winter chill against blossom protection. Plums flower early enough to lose a crop to frost most years, which is the one real argument for cover — and it works only if the house is opened all winter.A fan-trained tree on Pixy or similar; Ventilation all winter
Polytunnel	Improves reliability source GrowingHQ editorial positionmoderate confidence What protection is worth for this crop, judged against the same standard as every other record in this file. GrowingHQ editorial synthesis — GrowingHQ Checked 2026-08-13	Winter chill against blossom protection, on the same terms and with less structure to train against.

Growing it without soil

Nearly anything can be grown in a soilless system by somebody with enough equipment. The useful question is whether it is worth it, in which technique, and what goes wrong.

Not worth it

It can be made to grow, but a soilless system is the wrong tool — usually because of rooting volume, running cost, or a result no better than a pot of compost.

source

GrowingHQ editorial positionmoderate confidence

Root volume and chilling, and a tree that is difficult to keep small even on the most dwarfing stock available to it.

GrowingHQ editorial synthesis — GrowingHQ

Checked 2026-08-13

Plums are also the top fruit most prone to silver leaf through pruning wounds, and a permanently growing tree is pruned more often.

Techniques that suit it

Drip-fed mediumSolution is dripped into an inert medium around each plant. The most forgiving technique and the one that suits large, long-season, heavy crops.

Horticultural consensusDepends on conditionsmoderate confidence

Applies when: Substrate only.

No external citation — see the evidence type above.

Checked 2026-08-13

Root space: Very large, permanently.
pH band: 5.5–6.5

Where these figures come from

Root spaceHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

pH bandSourced guidancehigh confidence

Outside roughly this band, individual nutrients become unavailable even when they are present in the solution — which is why a crop can starve in a full reservoir.

Purdue Extension — Purdue University: Hydroponic solution management — pH

Checked 2026-08-13

No nutrient recipes here

GrowingHQ records pH bands, which are measurable properties of nutrient availability, and deliberately records no EC or PPM targets and no mixing instructions. Published targets vary by cultivar, growth stage, water source and technique, and the figures that apply to your system are on the product you bought.

Harvesting

When it is readyRipe when the fruit softens slightly and parts easily from the spur. Plums for cooking are picked slightly firmer than those for eating.
How to pick itPick with the stalk attached where possible; the fruit keeps a day or two longer.
Keeping itDays rather than weeks. Freezes well once stoned.

Where the harvest guidance comes from

When it is readyHorticultural consensusmoderate confidence: Royal Horticultural Society: Growing plums
Checked 2026-08-13
How to pick itHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
Keeping itHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13

What goes wrong

Problem	How often	Notes
Normal autumn leaf fall	common source Horticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13	Seasonal, and the reason an autumn yellowing should not be read as a deficiency.
Natural fruit drop	common source Horticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13
Silver leaf	occasional source Sourced guidancehigh confidence Royal Horticultural Society: Silver leaf Checked 2026-08-13	Uncommon in a tree pruned at the right time of year, and the reason that rule exists.
Bacterial canker	occasional source Sourced guidancehigh confidence Royal Horticultural Society: Bacterial canker Checked 2026-08-13	The other half of the dying-branch question on a plum, and told from silver leaf by the gum on the bark and the shot-holed leaves rather than by the wood.
Brown rot	common source Sourced guidancehigh confidence Royal Horticultural Society: Brown rot Checked 2026-08-13
Poor fruit set	common source Horticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13	Almost always frost during the early flowering.
Fruit splitting	occasional source Horticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13
Aphids	common source Horticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13

Start from what you can see

Fruit splitting or cracking

Grown with, grown after, grown instead

Every relationship states its mechanism. A pairing nobody can explain is a pairing nobody has checked, and it does not go in.

Shares a problem withCherry
Both are Prunus and both are susceptible to silver leaf through pruning wounds, so both follow the same rule of pruning only between late spring and midsummer. The shared rule follows from the shared susceptibility.
source
Sourced guidancehigh confidence
Royal Horticultural Society: Silver leaf
Checked 2026-08-13
Alternative toApple
Where an apple would need a pollination partner and there is only room for one tree, a self-fertile plum crops alone. It is the standard answer to 'I have space for one fruit tree'.
source
Sourced guidancehigh confidence
Royal Horticultural Society: Fruit pollination
Checked 2026-08-13

Safety and edibility

Which parts are ediblechildren
Plum stones, like the seeds of other Prunus species, contain amygdalin and release cyanide when crushed or chewed. The flesh is entirely safe; the kernel inside the stone is not a food.
source
Horticultural consensushigh confidence
- Royal Horticultural Society: Potentially harmful garden plants
Checked 2026-08-13
Eat the flesh and discard the stones. Do not crack stones for the kernels, and pick up windfalls where small children play.

Sources for this page

Agriculture and Horticulture Development Board · GrowingHQ editorial synthesis · Royal Horticultural Society

Each figure on this page carries its own citation, under the “where these figures come from” note in its section. Record last reviewed 2026-08-13.

If something is wrong with it

Flowers dropping without setting fruit — 3 causes GrowingHQ holds for plum
Fruit splitting or cracking — 2 causes GrowingHQ holds for plum
Lower leaves turning yellow — 3 causes GrowingHQ holds for plum

Something else? Work through it with the diagnostic tool.