Weeping Willow

Weeping Willow.

Common name

Weeping Willow

Scientific Name

Salix babylonica 

Type of plant

Tree And Shrub Weeds

About this weed

This tree is a common sight along water courses and in ornamental gardens and parks. Originally from China it was introduced as a parks and garden plant and also planted along rivers to stabilise  banks. It grows to a height of 10 metres and is easily identified by its long weeping branches. The tree is a serious weed in the eastern States although not currently listed as  a Weed of National Significance (WONS).

Description

Willows are deciduous, weeping trees with a stout trunk, growing to about 10 m high. They always grow near fresh water and can be distinguished by their long slender weeping twigs. In West Australia only female plants have been recorded. They also form hybrids with S. alba and S. fragilis. Flowers are produced in early winter. Reproduction is by seed, vegetative regeneration like resprouting, root suckers or stem layering. The time to first flowering is 4+ years and the seedbank persists for only a short period from days to 1 year. Its response to fire is: green foliage and timber will burn in a hot fire; established trees may be killed; younger trees may resprout.

Impact on Bushland

Willows are serious weeds along rivers and creeklines. It is of concern for its potential to hybridise and spread in natural areas. These trees also increases the likelihood of bank erosion and large scale soil movement over time. They also consume large amounts of water and have massive leaf drop in autumn which can significantly affect water quality.

Location

They are usually found on rivers and creeklines in black peaty sand over clay and are beginning to spread over the Swan Coastal Plain.

Priority for removal

Medium: they can disrupt ecological processes or result in loss of biodiversity.

Management (hand)

Hand pull seedlings. Biological control of six willow species is under consideration in Australia.

Management (herbicide)

Cut and paint or stem inject using 50% Glyphosate throughout the year, however results may be variable in spring. Check restrictions on chemical use near waterways. Follow-up monitoring and control of regrowth from stumps, pieces of stems or seeds may be required for 3 to 5 years after initial control. Read the manufacturers’ labels and material safety data sheets before using herbicides. Optimal treatment months are August to November, but occasional treatment can be done at any time.

Flowering month/s

August, September, October

Flower colour/s

No data

Information source

https://florabase.dpaw.wa.gov.au/browse/profile/20063

Additional information

https://florabase.dpaw.wa.gov.au/weeds/swanweeds/

Hussey, B.M.J., Keighery, G.J., Dodd, J., Lloyd, S.G. and Cousens, R.D. (2007) Western weeds. A guide to the weeds of Western Australia, Second Edition, The Weeds Society of Western Australia, Victoria Park, Western Australia.

https://www.agric.wa.gov.au/pests-weeds-diseases/weeds/weeds-national-significance

Weeping Willow images


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Location

Urban Bushland Council WA Inc

2 Delhi Street West Perth WA 6005

PO Box 326 West Perth WA 6872

(08) 9420 7207 (please leave a message)