Introduced as an ornamental, candle bush can
clog creeklines and channels
Urban and surrounding areas
Urban areas are generally the most disturbed and modified, and
thus particularly susceptible to invasion by weed species. Weeds
such as coffee bush (Leucaena leucocephala) and centro
(Centrosema pubescens) are particularly common around urban
areas. In addition, ornamental plants may escape from gardens to
become troublesome weeds. Examples are candle bush (Senna
alata), poinsiana (Delonix regia), morning glory
(Ipomea spp.) and snakeweed (Stachytarpheta spp.).
The Darwin Botanic Gardens appear to have been the source of mimosa
pigra, bellyache bush and cutch tree (Acacia catechu).
Gamba Grass dries out later in the dry season
and has a greater biomass than native grasses—increasing the
rsik of hot fires
Increased intensity of fires
Gamba grass (Andropogon gayanus) and mission grass
(Pennisetum polystachion), both originally introduced as
pasture grasses, are especially common in the many very disturbed
areas around Darwin. Compared to native grasses such as sorghum,
these grasses promote very hot fires which are much more damaging
to native trees and shrubs, as well as being more dangerous and
difficult to control.