Kirin's Sakura Scan turns a beer can into a tree-health sensor — crowdsourced sakura data

Many of Japan's most beloved cherry trees were planted during post-war reconstruction and are now reaching 60–70 years old. Municipalities lack the staff, budget and survey data to manage them, and arborists say the first step to protection is simply knowing the state of the trees. Kirin Brewery, which launched its beer brand Harekaze in April 2024 with a program that donates a share of sales to preserving Japanese seasonal culture, kept hearing the same message from city officials and tree doctors: the data simply does not exist.

The answer was Sakura Scan, released on 17 March 2025 as the third round of 'Harekaze ACTION'. Using a browser-based AI camera, anyone can photograph a cherry tree, upload its location, and receive a judgment of the tree's health and estimated age. The AI was trained with about 5,000 arborist-annotated images, and the mass-produced beer can itself serves as a physical reference ruler so the phone photo has real-world scale. Every snapshot — blossoms in spring, leaves in summer, bare branches in winter — joins a database that municipalities and tree doctors can use for maintenance planning.

The idea turned a seasonal habit into a scientific instrument at national scale: it became the world's first crowdsourced sakura health database and generated 190 million engagements. In 2024 Harekaze ACTION donated about ¥108.55M across its programs, including ¥40M to sakura conservation in 47 municipalities, and in 2025 that support doubled to 94 municipalities. The work won Gold in Creative Strategy (Cultural Engagement) at Spikes Asia 2026 and a Lotus Roots award at ADFEST 2026.