Herbarin is primarily used in agricultural and horticultural applications as a natural fungicide. It helps protect crops and ornamental plants from fungal infections, particularly those caused by mold and mildew species. Due to its biodegradable nature, it is favored in organic farming and sustainable pest management practices. Herbarin is also explored for its potential in post-harvest treatment of fruits and vegetables to extend shelf life by inhibiting fungal growth during storage and transport. Additionally, it has shown promise in laboratory studies for antimicrobial applications in pharmaceutical contexts, though such uses remain under research.