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Cassia

Botanical name: Senna pendula
Noxious Weed Category: Class 4

Cassia   Cassia
Photos: Ku-ring-gai Council 

Description

Also known as Senna and Arsenic Bush. Originating in South American, Cassia is a perennial sprawling multi-stemmed shrub or tree up to 5m tall. Stems and leaves are hairless.

Compound leaves divide into 3-5 opposite pairs of oval leaflets. Leaflets are dark green with a yellow coloured edge. Bright yellow flowers with 5 petals, clustering at branch ends. Flowers in autumn. Hard black seeds in bean-like pods, 5- 10 cm long, narrow and rounded. Ripening in winter.

Dispersal

The large seed pods are eaten by birds and other animals.

Impact on bushland

It replaces native vegetation and establishes in a wide range of native plant communities, including coastal heath and scrubland, hinddunes and riparian corridors.

Control Measure

The growth of the plant must be managed in a manner that continuously inhibits the ability of the plant to spread and the plant must not be sold, propagated or knowingly distributed.

Control

Manual:

  • Dispose of the large seed pods. 
  • Cassia is easily dug out, removing all roots. 
  • Cassia may also be treated using the cut and paint technique.

See Manual Weed Control Techniques.

Chemical: Please contact your local control authority for advice on chemical control.

Similar species

Cassia is often confused with a native shrub Breynia (Breynia oblongifolia) as their leaves are similar, but Cassia leaflets grow in opposite pairs, while Breynia leaves are alternate. See the Look-a-likes booklet


Updated: 18 Jul 2016