Seasonality takes on a larger dimension, when one considers that some veg have various 'sub-seasons', like leeks and potatoes, i.e. 'earlies', 'late crops', summer cabbage and winter cabbage, etc.
Until now, I've never really gone to that sort of detail, but will next year, simply because planting times are better advertised these days, and it's easier to figure out what to grow where and when!