Finnish study reveals homegrown food can lower carbon footprint with sustainable practices

Growing food at home or in a vacation cottage can yield a lower carbon footprint than store-bought produce, provided that gardeners limit fertilizer use, avoid excessive purchases and journeys by fossil fuel vehicles, and minimize non-renewable energy for plant lighting. According to monitoring conducted by Yle and the Natural Resources Institute Finland (Luke), even small shifts in practices can significantly raise the carbon footprint of homegrown crops.

In a pilot study, seven Finnish amateur gardeners tracked their harvests alongside the inputs and tools used throughout the growing season. They cultivated a range of setups, from container-grown mushrooms to balcony gardens and expansive plots. Yle sought volunteers to maintain detailed logs of their output and inputs, allowing researchers to assess the carbon footprints based on the data collected. Researchers Kim Lindfors and Juha-Matti Katajajuuri evaluated the findings, emphasizing that these assessments are illustrative rather than definitive.

Unexpectedly, many participants recorded relatively low emissions. Previous research suggested that self-grown produce could have a significantly higher carbon footprint compared to large-scale commercial farming. However, initial findings indicate otherwise, according to Katajajuuri.

The study demonstrated that even minor, often overlooked factors—such as the type of lighting—could substantially impact the carbon emissions from small-scale farms. For instance, one gardener used LED grow lights, leading to notable emissions due to low yields and non-renewable energy sources. Overall, participants who focused on sustainability practices, including reusing materials and minimizing resource purchases, achieved better results.

The key takeaway for those wishing to cultivate food with minimal impact is simple: avoid unnecessary inputs, excessive lighting, driving, and purchases, as each factor can elevate the carbon footprint unexpectedly.