Despite high hopes for containing and eliminating the South African monadenia orchid, Disa bracteata, to the area where it was first discovered on Kangaroo Island, four populations have been found spread across almost 20km.
The original population of this dangerous invasive weed at the intersection of Playford Highway and Harriet Road, is still present and outbreaks have been found at Turkey Lane, Rowland Hill Highway and Squashy Creek.
The orchid is flowering at present and is easily recognisable. Authorised officers are currently removing plants at all locations. If you find plants, please report them to the Board. If possible, remove the plants by digging them out. Each plant has two bulbs and both must be removed for control.
Monadenia is tolerant of a range of soil types and prefers sites where there is soil disturbance. It is a successful weed because it produces millions of dust-like seeds that are readily spread by wind, water, soil movement and machinery. Car movements can also spread the seed, which remains viable for up to seven years.
Monadenia orchids establish high density populations quickly, and can out-compete and exclude native flora such as orchids and grasses. The population on KI is still relatively small and could be controlled if a strong effort is made by everyone now.
Salvation Jane is also flowering at present. If you see these plants, please also remove by hand pulling and burning or notify the Board.
Please call in at KI Natural Resources Management Board at 35 Dauncey Street Kingscote, phone 8553 4300 or email info@kinrm.com.au.