Alien plant species
The reserve is relatively alien free, due to the hard efforts of “hackers” that cleared the dense patches of aliens in the reserve in its early years.
Invasive aliens are considered a threat to the fynbos of the reserve and are to be eradicated where ever possible.
There are very small-scattered alien individuals that are found in inaccessible areas and a team of well equipped ardent mountain climbers will clear these individuals.
The following species are considered
Invasive alien plants:
Species – Common Name
Acacia cyclops – Rooikrans/Red eye
Acacia longifolia – Long-leaved wattle
Acacia mearnsii – Black wattle
Acacia saligna – Port Jackson
Hakea gibbosa – Rock hakea
Hakea sericea – Silky hakea
Leptospermum laevigatum – Australian murtle
Paraserianthes lophantha Australian – Albizia/ Stinkbean
Pinus pinaster – Cluster pine
Rubus cuneifolius – American bramble
However, a seed destroying weevil, Melanterus servulus has been released for the biological control of Acacia cyclops. The introduced fungus Uromycladium teperianum effectively reduces the spread of Acacia saligna. The fungus is identified as “ Mud clods” all over the plant when one passes a dense patch of Port Jackson. A leaf-mining moth has been introduced at the “Fisheries”, below Vogelgat as an experimental breeding zone, monitored by the Plant Protection Institute for the control of Leptospermum laevigatum. The Keurboom (Virgillia oroboides) is considered to be a invasive indigenous tree that does not occur naturally in this reserve, but because of their fast growing trends have been planted at Base Camp and they have the tendency to have extremely high seed production, which if not kept in check invade the watercourses. Unfortunately neighbouring lands are infested with hakea, Port Jackson, Pines, Rooikrans and Australian myrtle, which reseed into Vogelgat.