Tree or shrubtree ornamentalStraightforward

Rowan

Sorbus aucuparia

A native upland tree that behaves impeccably in a garden: narrow, light-canopied, hardy to anywhere in Britain, and hung with orange-red berries from August that are among the most valuable bird food a garden can offer. It casts little enough shade that things grow underneath it.

Position: Full sun or Partial shade
Water: low demand
Drainage: Free-draining, Moisture-retentive
Grows to: 600–1200 cm × 400–700 cm
Hardiness: H7
Harvest: August to October
Difficulty: Straightforward

August

Harvest

Rowan’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	M	A	S	O	N	D
Plant	January.	February.	March.					November.	December.
In flower				May.
Harvest					August.	September.	October.
Prune	January.							November.	December.

Names that cause confusion

mountain ash — Rowan is not an ash and is not related to one — the name comes from the similar pinnate leaves. True ash is Fraxinus, and the distinction matters because ash dieback affects Fraxinus and not Sorbus.

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.

Conditions it needs

Light: Full sun, Partial shade
Frost: Very hardy
Hardiness rating: H7 (RHS)
Grows best at: 6–24 °C
Soil: Loam, Sandy, Clay, Peat-free compost
Soil pH: 4.5–7
Drainage: Free-draining, Moisture-retentive
Water needs: low
Drought: moderate tolerance
Waterlogging: poor tolerance
Heat: moderate tolerance
Wind and exposure: good tolerance

Where these figures come from

LightSourced guidancemoderate confidence

Royal Horticultural Society: Rowan — position

Checked 2026-08-13

FrostSourced guidancehigh confidence

Royal Horticultural Society: Rowan — hardiness

Checked 2026-08-13

Hardiness ratingSourced guidancemoderate confidence

Royal Horticultural Society: RHS hardiness ratings

Checked 2026-08-13

Grows best atSourced guidancemoderate confidence

Royal Horticultural Society: Rowan — temperature

Checked 2026-08-13

SoilSourced guidancemoderate confidence

Royal Horticultural Society: Rowan — soil

Checked 2026-08-13

Soil pHSourced guidancemoderate confidence

Plant Finder — Missouri Botanical Garden: Sorbus aucuparia — culture

Checked 2026-08-13

DrainageSourced guidancemoderate confidence

Royal Horticultural Society: Rowan — soil

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 exposureHorticultural consensusmoderate confidence

A mountain tree; takes exposure that flattens most others.

No external citation — see the evidence type above.

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	Rowan 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	Prefers this soil	Sandy suits Rowan as it stands: The pH suits it: it wants 4.5 to 7, and this soil is in that range. The free drainage is exactly what it wants. Sandy soil is among the soils it is recorded as suiting.
Chalky and alkaline	Works, with one condition	Rowan will crop on chalky and alkaline, but one thing has to be dealt with first. The soil is substantially too alkaline for it: it wants pH 4.5 to 7, and this soil sits around 7.8 to 8.5.The pH is the obstacle. Small shifts are achievable and slow; large ones are not. On chalky and alkaline the dependable answer is a container of the right compost rather than an attempt to change the ground.
Loam	Prefers this soil	Loam suits Rowan as it stands: The pH suits it: it wants 4.5 to 7, and this soil is in that range. The free drainage is exactly what it wants. Loam is among the soils it is recorded as suiting. The soil holds moisture, which saves a great deal of watering.
Silty	Prefers this soil	Silty suits Rowan as it stands: The pH suits it: it wants 4.5 to 7, and this soil is in that range. The free drainage is exactly what it wants. The soil holds moisture, which saves a great deal of watering.
Peaty and acid	Works, with one condition	Rowan 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	Prefers this soil	Shallow over rock suits Rowan as it stands: The free drainage is exactly what it wants. Loam is among the soils it is recorded as suiting.
Made ground and urban soil	Works, with one condition	Rowan will crop on made ground and urban soil, 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.

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

Space and spacing

Mature height: 600–1200 cm
Mature spread: 400–700 cm
Rooting depth: 120 cm
Spacing: 500–700 cm apart

Where these figures come from

Mature heightHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
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 guidancemoderate confidence: Royal Horticultural Society: Rowan — spacing
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.

Habit and ultimate size

What the plant becomes, rather than what it is when you buy it. The gap between the two is where most planting mistakes live.

Foliage: Deciduous
In a container: Not a realistic container plant

Where these figures come from

FoliageSourced guidancehigh confidence: Royal Horticultural Society: Sorbus aucuparia — foliage
Checked 2026-08-13
In a containerHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13

Growth rate: Moderate — roughly 30–60 cm a year
Ultimate height: 600–1200 cm
Ultimate spread: 400–700 cm
Time to reach it: 20–30 yearsSourced guidance

Where these figures come from

Growth rateSourced guidancemoderate confidence: Royal Horticultural Society: Sorbus aucuparia — growth rate
Checked 2026-08-13
Ultimate heightSourced guidancemoderate confidence: Royal Horticultural Society: Sorbus aucuparia — ultimate height
Checked 2026-08-13
Ultimate spreadSourced guidancemoderate confidence: Royal Horticultural Society: Sorbus aucuparia — ultimate spread
Checked 2026-08-13
Time to reach itSourced guidancelow confidence: Royal Horticultural Society: Sorbus aucuparia — time to ultimate size
Checked 2026-08-13

Root space. A narrow crown and a comparatively deep root system, so it competes less with planting beneath it than a birch of the same size does.

source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Cutting it back. Prune only in late autumn or winter, and lightly. Sorbus admits fireblight and silver leaf through wounds, so a large cut is a real risk rather than a theoretical one.

source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Value to wildlife

Recorded only where the evidence names a resource and the months it is available. Most plants flower; that on its own is not what this section is about.

Nectar: Useful, among other plants
Berries for birds: A significant source
In flower: May
In fruit: Aug, Sep, Oct

Where these figures come from

NectarSourced guidancemoderate confidence: Royal Horticultural Society: Sorbus aucuparia — value to pollinators
Checked 2026-08-13
Berries for birdsSourced guidancemoderate confidence: Royal Horticultural Society: Sorbus aucuparia — fruit and birds
Checked 2026-08-13

What keeping this costs

Less of a management conflict than the rest of this list, because the berries are stripped by blackbirds and thrushes fast enough that nothing done afterwards matters much. Worth stating only that removing the fruit for tidiness removes the entire point of the 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 guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13
Traditional dug bed	Workable source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13
Raised bed	Marginal source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13	A raised bed rarely holds enough soil volume for a tree beyond its first few years.
Container	Marginal source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13

Growing it

PlantingOne of the few trees genuinely suited to a cold, wind-exposed or northern garden, and to thin acid soil. Its narrow crown and light canopy make it one of the better choices where a tree must not dominate.
PruningPrune in late autumn or winter if at all. Sorbus is prone to fireblight and to silver leaf, both of which enter through wounds, and cuts made in the dormant season are far less likely to admit either.

Where this guidance comes from

PlantingSourced guidancehigh confidence: Royal Horticultural Society: Sorbus aucuparia — position
Checked 2026-08-13
PruningSourced guidancemoderate confidence: Royal Horticultural Society: Sorbus — pruning
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.

Sources for this page

GrowingHQ editorial synthesis · Plant Finder · 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 2026-08-14.