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German wasp | Vespula germanica

German wasp

Vespula germanica

Coral bush | Ardisia crenata

Coral bush

Ardisia crenata

Purple loosestrife | Lythrum salicaria

Purple loosestrife

Lythrum salicaria

Pom pom weed | Campuloclinium macrocephalum

Pom pom weed

Campuloclinium macrocephalum

Canarybird bush | Crotalaria agatiflora

Canarybird bush

Crotalaria agatiflora

Peanut butter cassia | Senna didymobotrya

Peanut butter cassia

Senna didymobotrya

Rubber vine | Cryptostegia grandiflora

Rubber vine

Cryptostegia grandiflora

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Environmental Programmes

In order to tackle our country’s socio-economic challenges, the government adopted the Outcomes based approach to improve government performance and providing focus on service delivery. find out more

Australian blackwood

Acacia melanoxylon

Common name:

Australian blackwood

Scientific name:

Acacia melanoxylon

Alternative common names:

Paluma blackwood, Sally wattle, Tasmanian blackwood

Australian Blackwood is a tree up to 20 m high, with a bole of about 150 cm in diameter. The bark on older trunks is dark greyish-black in colour, deeply fissured and somewhat scaly. Younger branches areribbed, angular, or flattened towards their tips and are greenish in colour.

These branchletsare usually mostly hairless (glabrousorglabrescent), but the stems of younger plants are sometimes more obviously hairy (denselypubescent).

Additional Info

  • Where does this species come from?

    eastern and south-eastern Australia.

    What is its invasive status in South Africa?

    NEMBA - Category 2

    Where in South Africa is it a problem?

    Western Cape, Free State, Eastern Cape, KZN ,Mpumalanga , and Limpopo .

    How does it spread?

    The seeds are spread by animals, particularly birds, and they may also be dispersed in dumped garden waste and contaminated soil. The seed-containing pods are also known to float on water. Root suckers can spread laterally some distance and enable the formation of dense clumps or thickets from a single plant.

    Why is it a problem?

    In South Africa it is a major invader of forests and is a particularly serious threat to 'fynbos' shrubland and grassland areas. It is known to transform these communities by replacing the native non-tree vegetation. It is considered to be difficult to control because of its fast growth rate, vigorous regrowth from root suckers, and prolific regeneration from seed.

    What does it look like?

    Leaves: Alternate - Phyllodes, greyish turning dark dull-green, ± erect, straight to slightly curved, with 3-7 prominent longitudinal veins and fine net-veins between; often bipinnate on young plants and coppice shoots. Flowers: Pale yellow, globular flower heads. Fruit/seeds: Legume - Reddish-brown pods, narrower than leaves, slightly constricted, twisted; seeds almost encircled by pinkish-red seed

    Does the plant have any uses?

    Timber, shelter, and ornamental plants.

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General News Updates

2019 National Symposium on Biological Invasio…


This is your invitation to South Africa's 2019 National Symposium on Biological Invasions. The convention is hosted by the Centre for Invasion Biology (CIB), University of Stellenbosch, and the Biolo... Read more

2019 Invasive Species Training


During the past five years (2014-2018), ISSA invasive species trainers have trained 4 000 in the identification of invasive species and laws pertaining to invasive species across South Africa.  ... Read more

Alien Grass Working Group


Who are we? The South African National Alien Grass Working Group was jointly initiated by the South African Biodiversity Institute (SANBI) and the Centre for Excellence in Invasion Biology (C·I·B) in... Read more

Permits for planting indigenous Cynodon?


On 16 February, 2018, South Africa's Department of Environmental Affairs issued amendments to the regulations and lists relating to the National List of Invasive Species.  Updates to the draft&n... Read more

Invasive species training 2018 dates released


Interested in invasive species?  How much do you know about NEMBA invasive species compliance for landowners and organs of state? The South African Green Industries Council (SAGIC) have released... Read more

Communications post for Africa advertised


The Nature Conservancy has advertised a brand new post:  Communications Manager, Africa Region. Knowledge of invasive species and water would be an asset in this post. See details below:    Job Titl... Read more