From the early date of its leafing year by year, a horse-chestnut in the Tuileries is known as the "Marronnier du 20 mars."
Keeping a gardening journal will help you pinpoint which natural events, such as frog calls, the return of particular birds or the leafing out of trees will coincide with frost-free days in your region.
No messy button-pressing-combination mambo, no leafing through old magazines to find your favorite cheats, and no jumping through hoops or repeating dastardly chores.