Boneseed
Asteraceae - Chrysanthemoides monilifera

What does it look like?

Bushy, semi-woody, many-branched shrub or small tree which grows to 2-3m. Ribbed and furry young stems that become smooth as they mature. Smooth, leathery, bright-green leaves (7cm x 3.5cm) have irregularly toothed edges and are arranged alternately on the stems.

Bright yellow daisy-like flowers (2.5-3cm diameter) are produced from September to February. These are followed by hard oval green fruit (6-9 mm) which ripen to black, each containing a hard seed.

Why is it a problem?

Boneseed grows on sand dunes, scrubland, coastal cliffs, offshore islands and even rocky outcrops. It quickly forms an incredibly dense cover that shades out other plants and limits access to coastal areas.

A single boneseed bush can produce 50,000 seeds every year, and each seed can remain dormant for up to 10 years. Tolerates most coastal soil types, salt, fire, wind, poor soils and drought.

 

Control Methods

 

Physical control:

  • Hand pull all but the largest plants (all year round) when not in seed. Leave on site to rot down.

Herbicide control:

  • Stump swab (all year round) with either:
    Glyphosate 100ml per 10L water;
    OR
    Metsulfuron-methyl (600g/kg) 1g per 1L water;
    OR
    Vigilant gel;
    OR
    Triclopyr (600 EC) 100ml per 1L water
  • Spray: glyphosate 10ml + penetrant per 1L water. 

Plants with seed must be buried deeply, burnt, or disposed of at a refuse transfer station. Follow up at six-monthly intervals to complete eradication.

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