Every season gives new experiences...
One summer can be hot and dry, another cool and wet/rainy... your
plants will grow differently
accordingly to what they recieve...
And as a gardener, that's how I learn, and learn from what occured, or what occured last year and how the next season changed it for the better or worse and grow in my gardening knowledge...
Also, if you kept your crop in the same place from year to year, and maybe don't ammend your soil...it may have depleted the nutrients last year that made it so good, and this year is lacing them...
have you added new ammendments?
Or a change in ammendments, new one's, or different one's. can also effect your crop..
Adding more manure one year can give you more green growth and slow on flowering...