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Name

Spiny head sida

Weed Habitat 

  • Considered to be from tropical America, this weed invades disturbed and overgrazed areas.

Description 

  • An erect small shrub growing to around 1.5 m.
  • Stems woody, branching several times, with well-developed tap root.
  • Leaves narrow, lance shaped, tapered both ends, serrated edges.
  • Yellow flowers, usually solitary or in pairs in the leaf axils.
  • Fruit is a hard, dark brown dry capsule, splitting into 5-8 segments each with a wedge-shaped, black seed having 2 sharp points at one end.

Sida acutaSida acuta

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Plant Type

Leaf Arrangement

Other weed identifiers

Plant Life Cycle

Weed Declaration

Currently not declared however under the Biosecurity Act 2014 you still have an obligation to prevent or minimise a biosecurity risk posed by a pest.

Weed Spread