When the next shipment of rooibos leaves South Africa this October, it won't be headed for a tea cup. Instead, thousands of seeds will launch toward the International Space Station, marking an unprecedented milestone for African science.
The seeds from South Africa's beloved red bush will spend at least six weeks in orbit, exposed to microgravity and space radiation, as part of an experiment organized by the South African Rooibos Council and facilitated by the space company MaxIQ Space. When they return to Earth in December or January, students will plant them alongside regular seeds to see if life in space changed them in any way.
"The seeds will be the first indigenous South African species, and the first seeds from the African continent, to go to space," said Dawie de Villiers, director of the South African Rooibos Council, in an interview with AFP.
The research aims to answer a big question: could plants like rooibos help feed humans living in space someday? Scientists want to understand how the seeds handle conditions beyond Earth, where radiation is stronger and gravity works differently. The answers could help researchers figure out how to grow food on long space missions or even on other planets.
Rooibos—Afrikaans for "red bush"—is a uniquely South African plant that grows only in the country's southeastern Cederberg region. The tea made from its leaves is naturally sweet, caffeine-free, and packed with antioxidants, making it popular worldwide. South Africa produces around 22,000 tons of it each year, depending on rainfall and temperatures. About half stays in the country for South Africans to enjoy, while the rest travels to more than 50 nations, with Japan, France, Germany, the Netherlands, and Britain as top buyers.
In 2021, the European Union granted rooibos special protection, meaning only tea made from leaves grown in the Cederberg region can legally be called "rooibos" in EU countries—a victory for South African farmers who have long fought against imitations.
During their space journey, the rooibos seeds will share the nanolab with more than a dozen student experiments as part of a program meant to inspire young people in science, technology, engineering, and math (STEM subjects). Once the seeds return, students across South Africa will help monitor them, looking for differences in how quickly they sprout and how they grow compared to ordinary seeds that never left Earth.
This experiment connects South Africa's agricultural heritage with humanity's future among the stars. Whether these seeds eventually help astronauts grow fresh tea on the Moon or Mars, they are already proving that small things—a few thousand tea seeds—can carry enormous hope.