The Stellenbosch University Botanical Garden houses many different plant collections ranging from indigenous and exotic species to bonsai. The Garden has recently implemented a new collections management system (IrisBG) which makes this information accessible to the public through Garden Explorer. The Garden's collections, amongst others, include the following:
Oxalis Research Collection (Cape sorrels)
This collection of Oxalis was initiated by Prof. Leanne Dreyer in 2001, and has grown to currently include about 70% of southern African species. The collection also includes 5 non-South African species, about 10 recently described species. About another 16 species that are new to science and in the process of being described. It acts as both a reference and research collection, and houses almost all specimens included in the species-level molecular phylogenetic reconstruction of southern African Oxalis. It continues to act as a source collection for morphological and molecular systematic research on the genus, and includes a number of highly threatened species. Thus far 9 M.Sc. and 2 Ph.D students made use of this collection, and 19 research papers are linked to plants cultivated in it.
South African Heritage Bonsai Collection
Although the collection started in the 1960's the bonsai and penjing only got a dedicated space in the Botanical Garden in 1972 when the collections of Becky Lucas and later Gerjo van der Merwe were acquired. The collection includes some excellent examples of African bonsai styles such as the flat-crown and baobab styles, as well as a variety of indigenous and exotic tree species, from wild olives (Olea europaea subsp. africana) to the redwood (Sequoia sempervirens). The collection houses some of the oldest bonsai from some of the first South African bonsai enthusiasts. The oldest bonsai on display is a Becky Lucas pine tree (Pinus sp.) dating from 1940 that is thought to be the oldest example of bonsai in Africa. Boland Bonsai Kai and their team of volunteers help with the specialist care needed to maintain this bonsai collection.
Pelargonium (Geranium family, malvas)
An extensive Pelargonium collection was built up by Prof J.J.A. van der Walt during the 1970s to 1990s. This collection formed the basis of his Pelargonium systematic research, and contained most species of the genus recognized at the time. For the more variable species, a number of duplicate accessions were included to reflect this natural variation. The Pelargonium research scaled down dramatically after Prof Van der Walt's retirement, and the main collection has been dismantled with many plants incorporated into the Garden itself. The Department of Botany and Zoology still maintains an extensive herbarium collection on Pelargonium, and some records are maintained in log books and records at the Department.