Pelham GardensGrow What Matters

Plum

One of the most forgiving UK fruit trees: many varieties are self-fertile, crop young, and reward almost no attention beyond summer-only pruning.

Written by Yemi · Last reviewed August 2026

Maturing this month
First sprouts in Not grown from seed for fruiting. Always bought as a grafted tree on a named rootstock

Difficulty

Plum

Plum should be ready to harvest this month. Check for size and colour.

Growing Calendar

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sow
Transplant
Bare-root / Sets
Harvest

This month: Sep

Log to journal

Ready to harvest now

  • Check size and ripeness
  • Harvest regularly
  • Store or use fresh

Sowing Guide

What you'd find on the seed packet

Sow Depth

Bare-root: roots spread fully in the hole, planted to the nursery soil mark on the trunk

Spacing

Roughly 3–4m for semi-dwarf rootstock (Pixy), 5m or more for more vigorous rootstocks (St Julien A)

Germination

Not grown from seed for fruiting. Always bought as a grafted tree on a named rootstock

Thinning

Not applicable at planting; fruit is thinned in June once established and cropping

Grower's Note

'Victoria' is genuinely self-fertile and one of the most reliable UK dessert/cooking plums, a sensible first choice if only one tree fits.

Recommended Varieties

'Victoria' holds an RHS Award of Garden Merit and is the classic dual-purpose plum for eating and cooking, ready late August into September. 'Opal' also holds an AGM, is self-fertile too, and ripens from early August, useful for a longer plum season or a spot where Victoria cuts it fine.

Planting Out Guide

Best spaces, conditions and how to plant out

Plant Spacing

See rootstock spacing above

Best Grown In

Open ground, sheltered from wind, which can damage early blossom and knock developing fruit

Conditions

Full sun, sheltered position, free-draining soil, ideally not a known spring frost pocket since plums blossom early

Grower's Note

Plum blossoms earlier than apple or pear, so frost protection during a late cold snap matters more here than for other tree fruit.

Rootstock & Eventual Size

Approximate height after ten years, next to an average adult for scale

Semi-Dwarf

Pixy

~3m after 10 years

Small gardens, fans, cordons

Moderate

St Julien A

~4.5m after 10 years

Bush trees, fans, espaliers

Vigorous

Brompton

~6.5m after 10 years

Large bush trees, traditional orchards

Growing Stages

Approximate weeks from sowing to harvest

Sprouting

wks

Seeds germinate and first leaves emerge. Keep warm and moist.

Establishing

104wks

Root system develops and plant builds structure. Pot on if needed.

Maturing

156wks

Plant reaches full size and begins producing. Harvest at peak.

Total~NaN weeksfrom seed to harvest

Climate Control

Today

C

Humidity

%

Water

Every 2–3 days

Sunlight

6+ hours direct sun

Watch Out For

Silver leaf disease causes a silvery sheen on leaves and can kill branches. Only prune in dry weather from May to August, never in winter

Plum moth larvae tunnel into the fruit. Pheromone traps from May and picking up windfalls promptly both help control it

Heavy crops can snap branches under their own weight. Thin fruit and support heavily laden branches rather than letting them tear

What You'll Need

Equipment for growing plum

Modular Seed Tray

96-cell for precision sowing

Fine Rose Watering Can

Gentle shower for seedlings

Bamboo Canes

Pack of 20 × 120cm

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Grown Organically

Every method in this guide works with natural systems: no synthetic chemicals, no shortcuts.

Read our approach

Common Questions

About growing Plum in the UK

Do plum trees need a pollination partner?

Many, including 'Victoria', are self-fertile and will crop alone. Some varieties do need a partner, so check the specific variety before assuming.

Why did my plum tree drop fruit early?

Some natural fruit drop in June is normal, the tree shedding what it can't support. Heavier drop can mean the tree was under-watered while fruit was swelling, or that it's simply carrying more fruit than it can properly ripen.

Why shouldn't I prune plum trees in winter?

Winter pruning wounds are the main entry point for silver leaf disease, which can kill branches or the whole tree. Prune only in dry weather between May and August instead.

How long until a plum tree fruits?

Often the quickest of the common UK tree fruits to start cropping: as little as 2–3 years on a semi-dwarf rootstock.

Written from real growing experience, not just research. Read the story behind Pelham Gardens.

Member guides

There's more to growing Plum than this guide covers.

A Garden Journal to log what worked, a personalised sowing planner in My Garden, and monthly reminders timed to the calendar.

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