Populus × canadensis 'Robusta' (m)

RHS Plant Profile

Canadian poplar 'Robusta'

Synonyms

Populus 'Robusta'

Trees

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A vigorous, large deciduous tree to 25m or more, of narrow conical habit. Leaves oval to triangular, bronze-red in early summer, becoming greener in summer and yellow in autumn. Red male catkins or green female catkins

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

Higher than 12 metres

Max Spread

wider than 8 metres

Size

Time to Maturity: 10–20 years
Max Spread: wider than 8 metres
Max Height: Higher than 12 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: South–facing or West–facing
Exposure: Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H7

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Salicaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Columnar upright
Genus: Populus are deciduous trees, mostly very fast-growing and large, with male and female catkins on separate trees, opening before the leaves. Male catkins are the more ornamental, female ones can be a nuisance from the cottony, wind-blown seeds
Name Status: Accepted

How to Grow

Cultivation

Cultivated for their very rapid growth as specimen trees. Useful as windbreaks. Tolerant of any soil other than constantly waterlogged soils. Avoid growing within 40m of buildings as the vigorous root systems may damage drains and foundations, particularly on clay soils; has the potential to become a nuisance

Propagation

Propagate by hardwood cuttings in winter and suckers in autumn or late winter

Suggested planting locations and garden types

Architectural
Low Maintenance
Hedging and screens

Pruning

Pruning group 1 in late summer to avoid infection from bacterial canker and bleeding from pruning cuts. Train as a central-leader standard. Never allow competing leaders to develop. Established trees need little pruning; sucker removal in autumn or winter

Pests

May be susceptible to leaf beetles, sawflies and caterpillars

Diseases

May be susceptible to leaf spots, poplar bacterial canker, tree rusts and honey fungus