Take peas. Last year I grew peas Oregon Sugar Pod and petit pois Waverex. OSP was a success and the petit pois were a dismal failure. Undeterred this year - and really just because I had seed left over- I sowed some more this year. The Waverex did stunningly well.
Here's something I won't forget: the dismal results from my experiment with growing cucumber out of doors. Last year I got three fruit from one of these grown in a plastic greenhouse. This year in the greenhouse and outdoors - nul points!
So to return to the point. You never know, one winters evening, when there's nothing on TV or the internet, I might actually review my diaries and see if there is any useful information to be extracted from them. Normally they are just a short term reminder of what I have done when or a way externalising thoughts and setting reminders for myself. Will they be anything more? I'll let you know.