OXALIS

Oxalis is one of the most common weeds in the home garden. It is a perennial weed and can last and divide in the soil for many, many years. It has a reputation for being an extremely hard weed to get rid of. Oxalis pes-caprae is from the family Oxalidaceae. It has many other names including Soursop, Yellow Sorrel, Variable Wood Sorrel and Sour Grass. Most gardeners in Australia know it as Oxalis or Soursop.
Oxalis showing the lush growth above ground. An almost hairless plant with long-stalked, trifoliate leaves that often have dark spots. The radiating clusters of drooping yellow, 5 petalled flowers are in clusters of 3-16 flowers on long slender stalks held well above the leaves from June to November. There are 10 stamens and 5 styles. The fruit is a narrow capsule. Oxalis has annual tops with a perennial root system with a vertical rhizome, bulbils and a bulb.

It is an incredibly competitive and invasive species. The roots creep and move throughout the turf making it difficult to eradicate, as the plant can be weak stemmed and the root often remains behind when the weed is uprooted.

Occurs in Western Australia, South Australia, Queensland, New South Wales (including Lord Howe Island); also New Zealand, New Guinea.

Spray FireHawk Bioherbicide Concentrate: 50 mL/L of water. Respray when regrowth occurs from roots and/or runners. May require repeated application to obtain long-term weed control.