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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

Ash leaved maple

Acer negundo ash

Common name:

Ash leaved maple

Scientific name:

Acer negundo ash

Alternative common names:

Box elder

Deciduous tree 10 to 20 m high with a spreading crown and often more than one trunk; bark is greenish smooth at first, aging to brown and rough. Leaves bright green, paler and sometimes densely hairy beneath, turning yellow in autumn; 3 – 9 pinnate, but mostly with 5 leaflets; leaflets coarsely toothed, 50 – 100 mm long. 

This fast-growing species is particularly invasive along waterways (i.e. in riparian areas) and in sheltered forests in temperate zones, but it has the potential to invade other habitats.

Additional Info

  • Where does this species come from?

    North America.

    What is its invasive status in South Africa?

    NEMBA Category 3. Sterile Cultivators or Hybrids are not listed.

    Where in South Africa is it a problem?

    North America. Free State ,KwaZulu Natal,Limpopo

    How does it spread?

    Large trees that are cut or damaged will re-shoot vigorously and can develop a dense mutli-stemmed habit. These fruit are relatively light and are also spread by water, as well as in dumped garden waste. The seeds may also be dispersed by birds and other animals.

    Why is it a problem?

    It crowds and shades out native plants in sensitive bushland along watercourses, and has become a major riparian weed of a some waterways. It is also thought that dense long-term infestations of this species may cause significant damage to waterways by trapping sediment, causing erosion and depleting oxygen levels in the water as a result of shedding large quantities of autumn leaves.

    What does it look like?

    Leaves: Opposite - Bright green, paler and sometimes densely hairy beneath, turning yellow in autumn; 3 – 9 pinnate, but mostly with 5 leaflets; leaflets coarsely toothed, 50 – 100 mm long. Flowers: Greenish yellow, in drooping sprays, 100 – 200 mm long, early spring Fruit/seeds: Samara - Yellowish-brown, paired, winged nutlets (samaras), in drooping sprays.

    Does the plant have any uses?

    Ornamental plant and sometime used for making syrup

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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