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Dr Iain Paterson applying biocontrol agents to a cactus stand near Windhoek.
Photo: R. Thomson
A healthy Imbricated cactus. This species is aggressively invasive, forming impenetrable stands.
Photo: C Mannheimer
Rubber vine (Cryptostegia grandiflora) is a dangerous invader that grows up into trees and smothers them.
Photo: C Mannheimer

Alien Watch posters

Information on some of the most invasive alien plants in Namibia has been compiled into a series of 'Alien Watch' posters which can be downloaded below.