I’ve heard the old monks used to keep a simple chart of moon phases and rainfall, then write the data in the margins of their herb books. Those little spirals sometimes line up to give a rough idea of when a plant will bloom. If you’re looking for something more… algorithmic, the best you’ll find are those neat little tally charts in the village greenhouses that have been passed down through generations. They’re not code, but they’re all you need to keep your garden happy.