Rooibos in Space: South Africa’s Herb Reaches the International Space Station
In early 2025 a collaborative effort between the South African Rooibos Council, the space‑education firm MaxIQ Space, and the South African National Space Agency (SANSA) launched an experiment dubbed “Rooibos in Space.” The initiative sends rooibos (Aspalathus linearis) seeds to the International Space Station (ISS) to study how microgravity and cosmic radiation affect germination, growth, yield, and stress resilience.
From the Cederberg to Low Earth Orbit
The seeds were sourced from farms in the Cederberg region of the Western Cape, the heartland of South Africa’s rooibos industry. Seven local schools participate in the project, working alongside rooibos farmers to collect baseline data. After several weeks aboard the ISS in a NanoLab module, the seeds will return to South Africa for side‑by‑side comparison with a ground‑based control group kept under identical soil and temperature conditions.
According to Dawie de Villiers, director of the South African Rooibos Council, the project “places a beloved national product in a broader scientific context where plant biology, space exploration, and education intersect.” He emphasized that the effort also promotes scientific literacy and skills development for the next generation of researchers.
Hands‑On Learning for South African Students
Judi Sandrock, founder of MaxIQ Space, noted that the experiment gives learners practical experience in hypothesis formulation, data collection, and scientific analysis. Students will monitor germination rates, measure seedling height, record leaf development, and later assess biomass and antioxidant content—key quality attributes of rooibos tea.
- Learners will maintain lab notebooks and submit findings to a shared online portal.
- Parklands College in Cape Town runs a parallel ground experiment, enabling a direct comparison of space‑flight versus terrestrial conditions.
- Results will be presented at a national science fair and published in a peer‑reviewed journal focused on astrobiology.
Rooibos as a Growing African Export
Beyond its cultural roots, rooibos is a significant export commodity for South Africa. In 2025 the country shipped approximately 10,930 tonnes of rooibos to more than 50 international markets, surpassing the 10,000‑tonne threshold for the first time. Total annual production stands near 20,000 tonnes, with roughly half consumed domestically and the remainder exported.
The sector supports thousands of jobs across farming, processing, packaging, and retail. Moreover, rooibos earned Protected Designation of Origin (PDO) status from the European Union in 2021, restricting the “rooibos” label to products originating from the defined South African production area.
By sending rooibos seeds to the ISS, the project highlights an established African agricultural export within a research arena typically associated with high‑technology satellites and human spaceflight.
Precedent: Nigeria’s Egusi Seed Experiment
South Africa’s effort follows a similar African‑led space biology experiment. On 1 August 2025, egusi melon (Colocynthis citrullus) seeds from Oyo State, Nigeria traveled to the ISS aboard NASA’s SpaceX Crew‑11 mission. Led by Dr. Temidayo Oniosun, a Nigerian space scientist, the seeds remained in orbit for seven days alongside control samples from Armenia, Costa Rica, Guatemala, and Pakistan before returning to Earth for analysis.
Both initiatives demonstrate how culturally and economically important African crops can contribute to microgravity research, expanding the geographic diversity of space‑based agricultural studies.
Broader Context: Plant Research in Orbit
Space agencies have investigated plant growth in microgravity for decades, aiming to develop reliable food‑production systems for long‑duration missions.
- NASA’s Veggie hardware has successfully cultivated lettuce, Chinese cabbage, kale, and mustard aboard the ISS.
- In November 2022 the International Atomic Energy Agency (IAEA) and the UN Food and Agriculture Organization (FAO) sent sorghum and Arabidopsis thaliana seeds to the ISS to examine radiation‑induced genetic changes relevant to climate‑resilient crops.
- Studies focus on water uptake, nutrient acquisition, and light utilization without the directional pull of gravity.
Insights from such experiments could inform bioregenerative life‑support systems for future lunar bases and Mars habitats, while also offering breeding strategies for drought‑prone and temperature‑extreme regions on Earth.
Implications for Future Missions and Terrestrial Agriculture
If rooibos seeds exhibit altered germination rates or enhanced stress tolerance after space exposure, the findings could be leveraged to develop new cultivars with improved resilience—a valuable trait for farmers facing climate variability. Conversely, understanding any negative impacts will help refine growth protocols for edible plants in space.
The educational component ensures that the scientific knowledge generated is transferred back to local communities, reinforcing South Africa’s commitment to integrating indigenous agricultural heritage with cutting‑edge science.
Conclusion
Rooibos in Space exemplifies a multidisciplinary partnership that blends South Africa’s agricultural legacy, space‑agency expertise, and STEM education. By placing a nationally iconic herb in the unique environment of the ISS, the project not only advances our understanding of plant biology beyond Earth but also underscores the role of African contributions to global space research.
