The pink light seen 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 located inside the station’s Columbus Laboratory, where astronauts are tending crops as part of an ongoing experiment on 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 called Veggie as the station’s “mini space garden.” The unusual magenta glow, he explained, comes from a special lighting system designed to support plant growth in the orbit. According to the European Space Agency (ESA), the facility was used during Expedition 74 to host a study that investigated how plants grow 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. Still, scientists have been experimenting with growing vegetables and other crops in orbit for years, in hopes of learning how future crews might produce food during long-duration missions.The latest investigation focuses on alfalfa, a flowering plant grown widely across Earth for animal feed and soil improvement. According to ESA, the experiment sought to understand how alfalfa works with naturally occurring bacteria that can convert atmospheric nitrogen into compounds that plants can use.This process is routine in Earth’s ecosystems, but conditions on the station are very different. Without gravity influencing root growth, water movement, and plant development, researchers are interested in whether these biological partnerships would continue to function in the same way.
Plants grown in space may grow differently in microgravity; scientists found
This project, known as Veg-06, was not limited to nitrogen-fixing bacteria. The researchers also wanted to examine changes in lignin, a structural substance found in plant tissues.Lignin acts as a kind of natural support system, helping stems stay upright and providing rigidity to plants. On Earth, gravity plays a constant role in shaping the development of those structures. In orbit, where that force is largely absent, scientists have the opportunity to study whether plants structure themselves differently.These answers could help researchers better understand the biology of plants under unusual conditions, as well as provide insights related to agriculture on Earth.
Researchers investigate structural and chemical changes in plants grown in space
The alfalfa crop completed its growth cycle at the station. According to ESA, the astronauts harvested both the above-ground parts of the plants and their roots before placing the samples in cold storage.Those samples were later returned to Earth aboard SpaceX’s CRS SPX-34 cargo mission, where researchers will conduct detailed analyzes that can’t be done in orbit.The work has now moved from the station’s growing chamber to laboratories on the ground, where scientists can compare plants grown in space with their Earth-based counterparts and see subtle differences in structure, chemistry and microbial activity.
Space gardening provides both scientific and psychological benefits to astronauts
While research is aimed at exploring the future, astronauts often talk about plants in more personal terms. In her X post, Adenot described the experience of caring for the crop as homesick, saying there was something special about watching the plants grow and caring for them every day.This sentiment reflects a broader theme that has emerged from years of studying plants in space. Green leaves, earthy smells and the routine of caring for living things can provide a familiar connection to Earth within the highly engineered environment of a spaceship.According to ESA, the ability to grow fresh food could eventually become a key part of extended missions beyond low Earth orbit. As well as nutritional benefits, researchers are also interested in how plant cultivation might help the crew’s well-being during voyages that could last months or even years. For now, the glowing pink room remains a small corner of the International Space Station.