I’m not a gardener, but I have seen online where some people use a planner to track their gardening, allowing them quick reference year after year. They track things like weather and temperatures each day to see when the last frost in the spring happens, to give them a better idea of when to plant; they write when they planted what and where; they write blooming and harvesting, yields etc. Using a planner for this makes it easier to find dated entries and compare year to year.
Do you keep track of your gardening? What do you use?