The pink light visible in recent timelapse footage from the International Space Station is not a camera effect or a reflection from Earth. Instead, it comes from a small plant-growing facility tucked inside the station’s Columbus laboratory, where astronauts have been tending crops as part of an ongoing experiment into how plants behave beyond our planet.ESA astronaut Sophie Adenot recently offered a closer look at the project in a post shared on X, describing the brightly lit chamber known as Veggie as the station’s “little space garden”. The unusual magenta glow, she explained, comes from specialised lighting designed to support plant growth in orbit. According to the European Space Agency (ESA), the facility was used during Expedition 74 to host a study examining how plants develop in microgravity and how they interact with beneficial microbes.
International Space Station scientists study plant growth in space
Space stations are not places most people associate with gardening. Yet for years, scientists have been experimenting with growing vegetables and other crops in orbit, hoping to learn how future crews might produce food during long-duration missions.The latest investigation focused on alfalfa, a flowering plant widely cultivated on Earth for animal feed and soil improvement. According to ESA, the experiment sought to understand how alfalfa works alongside naturally occurring bacteria that can convert atmospheric nitrogen into compounds plants can use.That process is routine in Earth’s ecosystems, but conditions aboard the station are very different. Without gravity influencing root growth, water movement and plant development, researchers are interested in whether these biological partnerships continue to function in the same way.
Space- grown plants may develop differently in microgravity; scientists find
The project, known as Veg-06, was not limited to nitrogen-fixing bacteria. Researchers also wanted to examine changes in lignin, a structural material found in plant tissues.Lignin acts as a kind of natural support system, helping stems remain upright and giving plants their rigidity. On Earth, gravity plays a constant role in shaping how those structures develop. In orbit, where that force is largely absent, scientists have an opportunity to study whether plants build themselves differently.The answers could help researchers better understand plant biology under unusual conditions while also providing insights relevant to agriculture back on Earth.
Researchers examine structural and chemical changes in space-grown plants
The alfalfa crop completed its growth cycle aboard the station. According to ESA, astronauts harvested both the above-ground portions of the plants and their roots before placing the samples into cold storage.Those specimens were later returned to Earth aboard SpaceX’s CRS SpX-34 cargo mission, where researchers will carry out detailed analysis that cannot be performed in orbit.The work now shifts from the station’s growing chamber to laboratories on the ground, where scientists can compare the space-grown plants with their Earth-based counterparts and look for subtle differences in structure, chemistry and microbial activity.
Space gardening provides both scientific and psychological benefits for astronauts
While the research is aimed at future exploration, astronauts often speak about plants in more personal terms. In her X post, Adenot described the experience of caring for the crop as a reminder of home, saying there was something special about watching plants grow and tending to them each day.That sentiment reflects a broader theme that has emerged from years of plant studies in space. Green leaves, soil-like smells and the routine of caring for living things can provide a familiar connection to Earth within the highly engineered environment of a spacecraft.According to ESA, the ability to grow fresh food may eventually become an important part of extended missions beyond low Earth orbit. Alongside nutritional benefits, researchers are also interested in how plant cultivation might support crew wellbeing during journeys that could last months or even years. For now, the glowing pink chamber remains a small corner of the International Space Station.
