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Height and Spread Cottonwood can grow 15 to 30 metres or more in height and may have a crown width of 12 to 23 metres.

Hardiness Zone 2

Preferred growing conditions Grows best full sun and moist sites; however can tolerate drought on upland sites with a high water table.

Form When mature, branches spread open to form a large crown.

Flower/seeds Long strings of tiny brownish-red flowers (catkins) are surrounded by silken threads which turn into a mass of ‘cotton’ that contains light-brown seeds.

Leaf Bright green leaves, triangular-shaped that are 7 to 12 cm long turn to golden yellow in the fall.

Bark/wood Bark is usually grey and in mature trees appears to be ridged with deep furrows.

Fruit Not applicable

Pruning Prune to keep shape and remove damaged limbs. Sterilize pruning saws and shears with methanol (gasline anti-freeze) between cuts and between trees.

Problems (Disease/Insects)

Melampsora leaf rust, Septoria leaf spot, canker, wetwood, stem decay, poplar borer, aphics, poplar bud gall mite, poplar leaf beetles