Some cacti are highly invasive and must be removed and destroyed.
Imbricate prickly pear (Cylindropuntia imbricata)
NEM: BA Category 1b – remove and destroy
This cactus is tall and tree-like with an untidy growth pattern. It
grows 1-3m tall. It grows and spreads rapidly and is undesirable
in the garden.
Invasives ID Kit
Spiny invaders
Long spine cactus (Austrocylindropuntia subulata)
NEM: BA Category 1b – remove and destroy
This cactus grows large, up to 2m high and is difficult to control.
It is a fast growing species. It produces crimson-red to yellow
flowers with a rounded, cup-like profile. Often found in pots, it
spreads rapidly when allowed to grow in the open.
Chain-fruit cholla (Cylindropuntia fulgida var. fulgida)
NEM: BA Category 1b – remove and destroy
A tree-like and architecturally attractive cactus. The stems and
cladodes are covered with long, needle-like spines that have white,
papery sheaths that fit loosely around the spines and give the
plant a white appearance, and that the spines are exceptionally
dense. The barbs pull the spines deeper into your skin, and make
them very difficult to remove.
What can you do to prevent the spread of
invasive species?
Learn to identify invader species and inform other
gardeners to become eco-friendly and remove
invasive alien plants from their gardens.
For more information, visit www.invasives.org.za
Teddy-bear cactus (Opuntia microdasys)
NEM: BA Category 1b – remove and destroy
This cactus has no distinct spines, but small tufts of hairs called
glochids which form small clusters on the cladode surface. They
detach easily and can penetrate the skin, causing dermatitis and
skin irritation which can last for months if not properly treated.
Despite this hazard, they are popular ornamentals.
Important: Cactus should never be dumped, as the cladodes
can often take root and spread. Herbicides can be used. Read
instructions carefully. Ideally, completely dry and burn the
cactus parts. Don’t shred, as small pieces can still regenerate.
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