Smoke bush (Cotinus coggygria) — care & requirements

In short

Airy, fluffy flower heads create the effect of “smoke” hovering over the shrub in summer.
Purple-leaved cultivars have dark leaves that turn red and orange in autumn.
Needs full sun and dry, well-drained soil — it tolerates moisture poorly.
The sap can irritate the skin — it is worth wearing gloves when pruning.
It can be grown for large leaves (hard pruning) or for abundant flowering (light pruning).

Botanical data

Family: Anacardiaceae (Anacardiaceae)
Height: 2–4 m
Width: 2–4 m
Habit: Spreading
Growth rate: Moderate
Position: Full sun, Partial shade
Soil: Sandy, Chalky, Loamy, Humus-rich
pH reaction: pH 5.5–7.8
Moisture: Dry, Moderate
Bloom: June–August
Hardiness: USDA 5a–8b
Propagation: From cuttings, By layering

Characteristics

A spreading, dense shrub or small tree with roundish, elliptic leaves — in the dark purple ornamental cultivars they turn to fiery red, orange and scarlet in autumn. In summer it forms loose, much-branched flower heads; the small flowers finish quickly, but their elongated, hairy flower stalks persist for weeks, forming the characteristic smoky cloud in a pink-violet shade.

Growing and care

Watering

Very drought-resistant once established. It does not tolerate standing water or heavy, permanently moist soils. Water only young specimens regularly.

In summer every ~14 days · drought tolerance: High

Fertilizing

Sparingly — on fertile, over-fertilised soil the shrub grows vigorously but colours more poorly in autumn and sets fewer flower heads.

rarely, only on very poor soils · kompost w niewielkiej ilości

Planting

It grows best on well-drained, moderately fertile or even poor soil in full sun — such conditions give the most intense leaf colour and the most abundant “smoke”.

Timing: spring or autumn · spacing 150–250 cm

Pruning calendar

Pruning group: Shrubs rejuvenated each spring (for ornamental stems/foliage)

IJan

IIFeb

IIIMar

IVApr

VMay

VIJun

VIIJul

VIIIAug

IXSep

XOct

XINov

XIIDec

Why then: Grown for colourful winter stems or large, ornamental leaves; a hard cut in early spring forces young growth, which is the most decorative.

What and how to cut

In early spring, before growth starts, cut last year's shoots low over the woody base (stubs of 2–3 buds); feed the plant after cutting. Do this only to plants that are already established (usually from the 2nd–3rd year after planting) — do not cut freshly planted ones this hard; let them root well first.

In early spring, before the leaves emerge.

What not to do

Don't do this to plants prized for their flowers on old wood — you will lose the flowering.

Companion plants

Good companions

English lavenderPractical observation

Both species like full sun and dry, well-drained soil — the smoke bush's purple leaves contrast beautifully with the violet of the lavender in a Mediterranean-style planting.

Blue fescuePractical observation

The silvery-blue grass tufts with similar dry requirements combine strikingly with the dark purple of the smoke bush's leaves.

Bad companions

Bigleaf hydrangeaPractical observation

The hydrangea needs constantly moist, fertile soil, while the smoke bush colours best on poor, well-drained ground and tolerates moisture poorly — they have conflicting site requirements.

The evidence level indicates whether the relationship is backed by research, observation, or gardening tradition.

Diseases and pests

Verticillium wilt

The first symptom is a sudden wilting and drying of leaves on individual branches or on one side of the crown, while the rest of the plant appears healthy. A cross-section of an infected shoot reveals a brownish or greenish discolouration of the wood — the vascular bundles clogged by the fungus, which can no longer conduct water. The disease progresses over successive years, affecting an ever-larger part of the crown and leading to the gradual death of the plant. Maples (especially Japanese maple), catalpa and many other trees, shrubs and perennials are particularly susceptible. The disease takes two forms: an 'acute' form, in which a branch or the whole plant dies rapidly within a few weeks, and a 'chronic' form — a slow decline spread over several seasons, with smaller, paler leaves, marginal scorching of the blades (resembling sunburn) and premature autumn colouring on infected shoots. The sectoral, one-sided distribution of symptoms is the hallmark of Verticillium wilt above all on woody plants — the part of the crown supplied by the clogged vessels dies off. The discolouration of the wood is best seen just under the bark as longitudinal streaks, and in cross-section as an interrupted ring; in maples it is often olive-green. Symptoms intensify in heat and during drought, when the demand for water exceeds the capacity of the damaged bundles. On herbaceous plants (dahlia, aster, chrysanthemum, tomato, potato, strawberry) one observes wilting and yellowing of the lower leaves, stunting and one-sided (half-blade) yellowing of the leaf — on these species, however, the symptom picture alone is unreliable for differentiation, because one-sided yellowing may also be caused by Fusarium wilt. The vascular discolouration by itself is not conclusive — a definitive diagnosis requires laboratory isolation of the pathogen.

Toxicity

For whom	Level	Notes
Humans	Mild	The sap from shoots and leaves can irritate the skin in sensitive people — the smoke bush belongs to the cashew family, related to the sumac. It is worth wearing gloves when pruning.
Dogs	Mild	—
Cats	Mild	—

History and origin

Cultivated in gardens for centuries, in the past also valued for practical use — a yellow dye (“young fustic”) was obtained from the wood, and the tannin-rich leaves were used for tanning hides. The purple-leaved ornamental cultivars, led by the popular 'Royal Purple', were selected in the 20th century and it is they that made the English name “smoke bush” famous.

Uses

Planted as a striking specimen, in groups and in naturalistic and Mediterranean-style plantings, where it is combined with grasses and drought-tolerant perennials. Valued for two seasonal displays — the summer “smoke” and the fiery autumn colours. Also used for bouquets.

Trivia

The “smoke” effect is created not by the flowers but by the elongated, downy-haired stalks of the spent flower heads.
The smoke bush belongs to the cashew family — among its more distant relatives are the mango, the cashew and the sumac.
The English name “smoke bush” refers directly to the airy flower heads that resemble billows of smoke.

Frequently asked questions

Why doesn't my smoke bush produce the characteristic “smoke”?

The most common cause is too hard a spring pruning. The fluffy flower heads develop on the previous year's shoots, so cutting the shrub back hard, though it improves the foliage, removes them. To obtain the “smoke”, prune only lightly and for shape.

How do you achieve the most intense autumn colouring?

The smoke bush colours best in full sun and on poor, well-drained soil. In shade and on fertile, over-fertilised ground the leaves stay greener in summer and redden more weakly in autumn. Limit nitrogen fertilising.

Is the smoke bush toxic?

The sap from shoots and leaves can irritate the skin in sensitive people, because the smoke bush belongs to the cashew family, related to the sumac. It is not strongly toxic, but when pruning it is worth wearing gloves and avoiding contact of the sap with skin and eyes.

Sources

Plants of the World Online (POWO)Database (GBIF, POWO…)
RHS — Cotinus coggygriaInstitution / botanical garden

Edited by:Redakcja Atlas-Flora. Updated: 7/15/2026.

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Smoke bush

USDA hardiness zones