Creeping flatweed

Creeping flatweed (Arctotheca prostrata) is a perennial herbaceous weed belonging to the Asteraceae family. It is known for its prostrate growth habit, where stems spread along the ground and develop roots at the nodes, allowing the plant to rapidly colonize bare soil and outcompete desired vegetation in both cultivated and non-cultivated areas.

Native to Southern Africa, this plant has become invasive in many parts of the world, particularly in Australia and the United States. It frequently appears in pastures, lawns, orchard inter-rows, and disturbed areas. Its ability to thrive in various soil types and moisture levels makes it a persistent nuisance for land managers and farmers.

The biology of Arctotheca prostrata is characterized by high reproductive efficiency. It produces numerous flower heads that generate a large quantity of wind-dispersed seeds. Combined with its capacity for vegetative spread, a small infestation can quickly expand into a dense, carpet-like mat that prevents the germination and development of other species.

The economic impact of this weed is significant, particularly in agricultural settings. It competes fiercely for water and nutrients, which can drastically reduce the yields of established crops. Furthermore, its presence in pastures reduces the density of nutritious fodder, as its leaves are often less palatable to livestock, leading to reduced grazing efficiency.

Effective control requires an integrated approach. Cultural methods include regular tillage to disrupt root networks and shading crops to limit the weed's light access. For chemical control, systemic post-emergence herbicides are most effective when applied during the plant's peak growth phase. Consistent follow-up treatments are essential, as soil seed banks can lead to recurring infestations even after the initial cover is removed.