OrnamentalclimberSome care needed

Evergreen climbing hydrangea

Pileostegia viburnoides

A slow, self-clinging evergreen with leathery dark leaves and creamy foam-like flower heads in late summer, when very little else is climbing anything. It attaches to a wall by aerial roots and needs no structure at all, and its restraint is the reason to choose it over the deciduous climbing hydrangea on a small house.

Position: Full shade or Dappled shade or Partial shade
Water: moderate demand
Drainage: Moisture-retentive
Grows to: 300–600 cm × 150–250 cm
Hardiness: H5
Flowers: August and September
Difficulty: Some care needed

August

In flower

Coming next month: plant.

Evergreen climbing hydrangea’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	A	M	A	S
Plant	April.	May.		September.
In flower			August.	September.
Prune	April.

Names that cause confusion

climbing hydrangea — Two different plants share this name. Hydrangea anomala subsp. petiolaris is the common deciduous one; Pileostegia viburnoides is evergreen, much slower and considerably smaller, and is the one worth having where winter cover is the point.

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 shade, Dappled shade, Partial shade
Frost: Hardy
Hardiness rating: H5 (RHS)
Grows best at: 7–24 °C
Soil: Loam, Peat-free compost, Clay
Soil pH: 5.5–7.5
Drainage: Moisture-retentive
Water needs: moderate
Drought: moderate tolerance
Waterlogging: poor tolerance
Heat: moderate tolerance
Wind and exposure: poor tolerance

Where these figures come from

LightSourced guidancemoderate confidence

Royal Horticultural Society: Evergreen climbing hydrangea — position

Checked 2026-08-13

FrostSourced guidancehigh confidence

Royal Horticultural Society: Evergreen climbing hydrangea — 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: Evergreen climbing hydrangea — temperature

Checked 2026-08-13

SoilSourced guidancemoderate confidence

Royal Horticultural Society: Evergreen climbing hydrangea — soil

Checked 2026-08-13

Soil pHSourced guidancemoderate confidence

Plant Finder — Missouri Botanical Garden: Pileostegia viburnoides — culture

Checked 2026-08-13

DrainageSourced guidancemoderate confidence

Royal Horticultural Society: Evergreen climbing hydrangea — 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

Wants shelter from cold drying wind.

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	Evergreen climbing hydrangea 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	Evergreen climbing hydrangea grows perfectly well on sandy without special measures, though it is not the soil it would choose.
Chalky and alkaline	Grows well here	Evergreen climbing hydrangea grows perfectly well on chalky and alkaline without special measures, though it is not the soil it would choose.
Loam	Prefers this soil	Loam suits Evergreen climbing hydrangea as it stands: The pH suits it: it wants 5.5 to 7.5, 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.
Silty	Grows well here	Evergreen climbing hydrangea grows perfectly well on silty without special measures, though it is not the soil it would choose.
Peaty and acid	Works, with one condition	Evergreen climbing hydrangea 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	Grows well here	Evergreen climbing hydrangea grows perfectly well on shallow over rock without special measures, though it is not the soil it would choose.
Made ground and urban soil	Works, with one condition	Evergreen climbing hydrangea 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: 300–600 cm
Mature spread: 150–250 cm
Rooting depth: 50 cm
Spacing: 150–250 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: Evergreen climbing hydrangea — 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: Evergreen
In a container: Not a realistic container plant

Where these figures come from

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

How it climbs: Self-clinging — needs no support structure
Vigour: Restrained — suits a small structure

Where these figures come from

How it climbsSourced guidancehigh confidence: Royal Horticultural Society: Pileostegia viburnoides — support
Checked 2026-08-13
VigourSourced guidancemoderate confidence: Royal Horticultural Society: Pileostegia viburnoides — vigour
Checked 2026-08-13

Support it needs. None. It grips a sound wall directly with aerial roots, so a trellis is wasted money — though the young growth usually needs holding flat against the surface for its first season or two while the roots take hold.

Effect on what it grows over. Attaches by aerial roots exactly as ivy does, with the same caveats: harmless on sound masonry in good pointing, and an opportunist on failing mortar. Its restraint is the practical difference — it does not reach the roofline of a small house the way the deciduous climbing hydrangea will.

source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

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	Well suited source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13
Raised bed	Workable source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13
Container	Marginal source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13

Growing it

TrainingSelf-clinging by aerial roots, so it needs a sound wall and no trellis. Young growth usually has to be held flat against the surface for its first season or two until the roots take hold — the plant's slowness is most obvious at exactly this stage and is not a sign that anything is wrong.
PlantingOne of the few climbers that flowers usefully on a shaded wall, and one of fewer still that does it in late summer. Give it a soil that does not dry out; the base of a north or east wall is often drier than it looks because of the rain shadow.
WateringWater regularly for the first three or four years. Like its relative the climbing hydrangea it is slow to establish and is usually planted against a shaded wall, where the soil is drier than it looks, and the establishment period is the whole of the risk with this plant. Mulch the root area to keep it cool and damp. Once it is up and clinging it needs nothing, and being evergreen it earns its wall all year.
FeedingA spring mulch and an occasional general feed while it is young; nothing once established. It flowers in late summer on the current season's growth, so a spring feed is the one that could help — but a plant flowering poorly is almost always still establishing, or too shaded, rather than hungry. Give it time before giving it fertiliser.

Where this guidance comes from

TrainingSourced guidancemoderate confidence: Royal Horticultural Society: Pileostegia viburnoides — support
Checked 2026-08-13
PlantingSourced guidancemoderate confidence: Plant Finder — Missouri Botanical Garden: Pileostegia viburnoides — culture
Checked 2026-08-13
WateringSourced guidancemoderate confidence: Royal Horticultural Society: Pileostegia viburnoides
Checked 2026-08-13
FeedingSourced guidancemoderate confidence: Royal Horticultural Society: Pileostegia viburnoides
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.

What goes wrong

Problem	How often	Notes
Not old enough to flower	common source Horticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13

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.