Page 19 - FWG Issue 2 March 2025

Gardening

cause severe allergic reactions, this tree
also releases allelopathic chemicals
that suppress other vegetation. Its
resilience and rapid growth make it
a formidable opponent in the battle
against invasive species.

Tecoma stans:
The Tenacious Yellow Bells
Tecoma stans, or Yellow Bells, is a
challenging plant to control. With no
registered herbicide treatment, the
most effective method is to remove
the stump entirely. This plant produces
abundant winged seeds that germinate
readily, allowing it to spread quickly.
Source: https://pixabay.com/photos/treetop-tree-leaves-foliage-167610/
Despite its invasive nature, T.stans has
economic uses in construction and
traditional medicine, adding a layer of
complexity to its management.

Solanum mauritianum:
The Bugweed Intruder
Native to South America, Solanum
mauritianum, known as Bugweed, is
causing significant issues in South
Africa’s forestry and sugar cane
industries. Birds, especially doves,
disperse their seeds, enabling them
to outcompete native vegetation.
However, Bugweed can be controlled
through cutting, stem painting, and
soil-applied herbicides. Additionally,
biocontrol agents like the leaf-eating
Gratiana spadicea and the sap-
sucking Gragaphina decoris have been
introduced to help manage its spread.

These five species are just a glimpse
Source: https://pixabay.com/photos/tecoma-stan-yellow-elder-7104781/
into the broader challenge of invasive
plants in South Africa. According to
the Nemba publication of 2014, there
are 379 registered invasive plants,
each presenting unique challenges
and requiring tailored strategies
for effective management. By
understanding and addressing these
green invaders, we can help protect
and preserve South Africa’s rich and
diverse ecosystems.

Source: https://identify.plantnet.org/k-world-flora/observations/1019823530

Fourways Gardens • 17 • March 2025